MAD DOG

Real Name: Robert "Buzz" Baxter

Identity/Class: Human mutate

Occupation: Super-villain/terrorist for hire (including work with Professor Power's Secret Empire, Mutant Force, and Roxxon), merchandising beneficiary;
   former security consultant to the Brand Corporation;
   former colonel in the United States Air Force
   former soda jerk

Group Membership: Secret Empire; formerly Brand Corporation, Roxxon Oil Corporation, US Air Force

Affiliations: A.I.M. (Advanced Idea Mechanics), Angar the Screamer, Assault and Battery, Batroc the Leaper, Blackheart, Blood Scourges, Bobcat, Brothers Grimm (Grimes brothers), Bullet Biker, Crossfire, Death-Throws (Bombshell, Knickknack, Oddball, Ringleader, Tenpin), the Eel (Edward Lavell), Ivory, Mr. Grant, Hugh Jones, Mutant Force (Burner, Lifter, Shocker, Slither), Orka, Overrider, Professor Power, Ramrod, Razorfist, the Secret Empire and operatives (Cloud, Harridan, Leviathan, Seraph), Smokescream, Squadron Supreme (Doctor Spectrum, Golden Archer, Hyperion, Lady Lark, Whizzer), Taskmaster, Thunderball (Eliot Franklin), the Tribunal, the Vanisher;
formerly Hellcat, Dorothy Walker, Joshua and Beatrice Walker

Enemies: Araña (Anya Corazon), Arcade, Avengers (Beast, Captain America/Steve Rogers, Iron Man/Tony Stark, Moondragon, Scarlet Witch/Wanda Maximoff, Thor/Odinson, Vision), Beast (Henry McCoy), Belial, Black Ant, G.W. Bridge, Captain America (Steve Rogers), Daimon Hellstrom, Defenders (Angel/Warren Worthington III, Beast/Henry McCoy, Cloud, Gargoyle, Iceman/Bobby Drake, Moondragon, Candy Southern, Valkyrie), Diamondback (Rachel Leighton), Doctor Doom, Dolly Donahue, Dum-Dum Dugan, Falcon (Sam Wilson), Fantastic Four (Ben Grimm, Human Torch/Johnny Storm, Invisible Woman/Susan Richards, Mister Fantastic/Reed Richards, Ms. Marvel/Sharon Ventura), Firebug, Tom Hale, Hawkeye (Clint Barton), Lockjaw, Mockingbird (Bobbi Morse), Nomad (Rikki Barnes) of Counter-Earth, Nick Fury, Gamma Flight (Laura Dean, Goblyn, Manikin, Persuasion, Witchfire), Hellcat, Hunter-Bots, Jubilee, Sharon King, Kraven the Hunter, Quasimodo, Chet Ripson, Shang-Chi, Siren (Jennifer Pearson), the Sk'ar, Super-Agents of S.H.I.E.L.D. (Ivory, Knockabout, Psi-Borg, and Violence), Taskmaster, Telekinian (Ian Soo), Trick Shot, Joshua Walker, Beatrice Walker, Windshear, General Wo, Hedy Wolfe

Known Relatives: Rachel Ford (estranged wife), Patsy Walker (ex-wife), Betty, Kenny (cousins), Sheree (adopted cousin)

Aliases: Mad-Dog, Buzz Baxter III

Base of Operations: Currently unknown; generally based at current headquarters of those who hire him (such as Professor Power's Secret Empire or Roxxon Oil);
    formerly Brand Corporation

First Appearance: (Metafictional) Miss America Magazine#2 (November, 1944); (as Buzz Baxter) Amazing Adventures I#13 (July, 1972); (as Mad Dog) Defenders I#125 (November, 1983)

Powers/Abilities: (from Mad Dog's OHOTMU entry) "Mad Dog possesses superhuman strength enabling him to lift (press) 5 tons under optimal conditions. Mad Dog possesses enhanced strength, agility, speed, and stamina, due to the cellular augmentation process he underwent. He also has a highly acute sense of smell and hearing, analogous to that of a dog. Further, his jaw muscles were bionically strengthened and he was given large canine teeth, enabling him to rend and grip things with his mouth. The teeth emit a foaming chemical poison, to which his body is immune, which causes paralysis and possibly death in whoever he bites." He also briefly used a wrist-mounted long-range teleport matrix from Roxxon.

Height: 6' 2"
Weight: 270 lbs.
Eyes: Yellow (formerly blue)
Hair: Black, with brown body fur

History:
(Hellcat II#4 (fb)) - In high school, Chet Ripson got expelled from school for cheating, though it was really Patsy who had done it. When Buzz picked a fight with Chet, Chet ended up breaking a bottle and then slashing one of the bullies' throats. Chet then drove off distraught and crashed his car, dying.

(Defenders I#87 (fb)) - Buzz Baxter and Patsy Walker were high school sweethearts. They decided to get married shortly after high school

(Defenders I#89 (fb)) - When Patsy chose to marry Baxter, her mother, Dorothy Walker, rejected the marriage. Patsy married Baxter anyway, in part to rebel against her mother.

(Defenders I#87 (fb)) - Baxter joined the Air Force. Soon after their marriage, he was sent off to a United States conflict in Vietnam.

(Avengers I#144 (fb)) - While in Vietnam , Baxter was wounded. He returned to Patsy a very different man. They spent years saving money and surviving on a lieutenant's salary, and Baxter was frequently frustrated and angry with Patsy. He sought out new work, hoping it would make things better.

(Solo Avengers I#9/2 (fb)) - Baxter, who had felt that Patsy had been so innocent, sweet, and in need of protection all through their marriage, grew frustrated and angry when Patsy started having independent thoughts and seeking to get a job.

(Amazing Adventures I#13 (fb)) - The Pentagon sent Baxter on special assignment to the Brand Corporation to act as their security consultant. There had been suspicious activity reported there due to several sightings of the grey-furred mutant, Beast.

(Amazing Adventures I#13) - Buzz Baxter and Patsy Walker were detained at the security gates at the Brand Corporation until their papers were found in order, and Baxter checked in with Mr. Grant. Baxter immediately began to work and investigated one of Brand's top scientists, Hank McCoy (who was secretly the Beast), by checking out McCoy's office. He planned to continue his investigation by illegally entering McCoy's apartment, but Patsy convinced him not to as it was wrong. He chided Patsy for being a ‘goody-goody.'

(Amazing Adventures I#14) - Baxter and Patsy watched the Beast storm the Brand base, avoiding a hale of bullets. When they went to investigate, they found Hank McCoy there (the Beast in disguise), and Baxter quickly grew suspicious. When Patsy tried to calm an angry Baxter down, he told her to shut up. Baxter caught McCoy in a lie, and demanded that McCoy come in the next morning for questioning. Baxter heard reports of the Beast in another part of the base and ran off to investigate (this time, the ‘Beast' was Quasimodo, but Baxter never saw him).

(Amazing Adventures I#15) - McCoy brought his friend Warren Worthington (secretly the Angel) into his meeting with Baxter and Patsy. Baxter confronted McCoy about his recent disappearances from work, and challenged the lie that McCoy told. When Patsy unexpectedly backed up McCoy's story, Baxter was shocked but had no choice but to believe her. Baxter let McCoy go with a warning.

(Avengers I#144 (fb)) - The Beast continued to evade security, and Baxter's reputation was tarnished beyond repair. Baxter knew that Patsy was keeping secrets from him. They grew more and more distant, and eventually divorced.

(Avengers I#141 (fb)) - The Brand Corporation became affiliated with Roxxon Oil, and Hugh Jones recruited Baxter to work for him. Baxter went along with Jones' plans for world domination, and agreed to help.

(Avengers I#140 - BTS) - The Beast, now a member of the Avengers, broke into the Brand Corporation, and noticed how lax Baxter's security procedures had gotten.

(Avengers I#141) - Jones and Baxter watched as the Avengers (Beast, Captain America , Scarlet Witch, Vision), who were following a lead, approached Brand. Baxter was shocked to see Patsy along with them, but didn't let that stop him. He called in the Squadron Supreme (Jones' operatives) to stop the Avengers. Baxter watched the Avengers' defeat, and watched as Patsy tried to join in the battle only to be felled as well. He admitted that he'd always suspected that Patsy had a connection to the Beast.

(Avengers I#142) - Baxter and Jones taunted the captive Avengers. Patsy and Baxter argued briefly.

(Avengers I#143 - BTS) - Using teamwork, the Avengers escaped from the cage they'd been kept in.

(Avengers I#144) - The Avengers and Patsy were led into the Brand Corporation's Classified Weaponry Section where Baxter and the Squadron Supreme tried unsuccessfully to kill them with missiles and a freefall. Patsy donned the Cat costume (which had been in Brand's custody) and christened herself Hellcat. The police soon arrived, having been notified by the missiles, so Hugh Jones teleported the Avengers and the Squadron Supreme to the Squadron's home dimension.

(Avengers I#149) - The Avengers (and Hellcat) successfully returned from the Squadron's universe, and quickly renewed their attack on Brand. As the Avengers began defeating Baxter's security forces, Jones accosted Baxter for being unprepared. Jones released Orka, who quickly defeated the Avengers. Though Baxter had some reservations, Jones had the Avengers put into a machine called the Electro-Incinerogram, which would painfully kill them. When Thor and Moondragon attacked, Orka was sent against them as well. Changing his mind, Baxter grew eager to see the Avengers and Patsy killed, but Jones told him to wait. Baxter was ridiculing Patsy for betraying him, and was shocked when Patsy got free and attacked. They battled and Patsy released her frustrations on Baxter. She threatened to scratch his eyes out if he didn't release the Avengers. Baxter did, and Patsy still scarred his cheeks with her claws. Thor defeated Orka, and Jones and Baxter were arrested.

(Defenders I#87 (fb)) - Baxter retired from the Air Force.

(Defenders I#87) - Baxter was called in to testify before what he thought was a government inquisition (but was secretly the alien Tribunal) against the Defenders. He wore his Air Force uniform. He testified against Patsy, and showed off the facial scars she had given him. He recounted his origins with Patsy.

(Defenders I#125 (fb)) - Baxter agreed to let Roxxon, through Brand Corporation, experiment on Baxter, granting him super-powers. He may have chosen the Mad Dog motif as a direct ploy on Hellcat. Professor Power may or may not have been involved in Baxter's mutation.

(Defenders I#125 (fb)) - Baxter was recruited by Professor Power to work with the Secret Empire, an organization bent on world domination by starting a world war. He agreed to lead the Mutant Force on Empire missions that called for super-human operatives.

(Defenders I#125) - Mad Dog waited on the ledge at Defenders Mansion , and overheard Patsy (who had joined the Defenders as Hellcat) tell Dolly Donahue about her upcoming marriage to Daimon Hellstrom. He reported in to the Secret Empire, and they ordered him to lead an attack on the wedding the following day, perhaps as a test for the operatives against super-powered foes. Baxter eavesdropped on the wedding party in Greentown , Ohio , and was soon joined by the Mutant Force. To remind the group who was boss, Baxter attacked Shocker. The five villains soon burst through the wall to attack the heroes, and Patsy immediately recognized Baxter, shocked that he had super powers. When Moondragon tried to subdue Baxter telepathically, he quickly put her out of action. Baxter threw Hellstrom to the side, pulled off his mask, and bit Patsy, releasing toxins into her blood. Before he could slit Patsy's throat with his claws, Moondragon zapped him aside with a psi-blast and Hellstrom punched him out. The Mutant Force was likewise defeated.

(New Defenders I#126) - Baxter and the Mutant Force were captured and held in a S.H.I.E.L.D. null-field, where they awaited questioning. A Secret Empire agent working as a mole for S.H.I.E.L.D. used Leviathan as a distraction, and released Baxter and the Mutant Force.

(New Defenders I#128) - Equipped with special strength-sapping devices, Baxter and the Secret Empire operatives (the Mutant Force, Harridan, Seraph, Leviathan -Cloud had defected and joined the Defenders) battled the Defenders (Baxter battled Gargoyle) and quickly defeated them.

(New Defenders I#129) - Baxter and the Mutant Force were sent to ensure that the Project: Sublimate satellite launched successfully. (The satellite would be used to start a world war). When the Defenders attacked, the villains held them off long enough for the satellite to launch.

(New Defenders I#130) - Baxter was controlling the satellite's path from the ground until a lightning bolt from Cloud shorted out the control panel. After the Defenders successfully stopped the satellite, Baxter led the Mutant Force in a last ditch attack, but they were quickly defeated.

(Solo Avengers I#9/2 (fb)) - Baxter was released from prison by some of his high-placed friends. He heard that Patsy was appearing on a Late Night TV show, promoting her new book, in which she told of her history with Baxter, portraying him as a villain.

(Solo Avengers I#9/2) - He stormed the studio in anger, knocked aside several pedestrians, and bit Patsy on the neck. After the poison knocked her unconscious, he took her to his lair in an abandoned workshop and changed her into her costume. They argued back and forth and Patsy's attempt at an attack failed due to the poison still being in her system. Baxter confessed he still loved Patsy, and told her where he thought their marriage had fallen apart, yet when she responded he kicked her down. Patsy lashed out at him, verbally and physically, and scratched Baxter's eyes. Patsy said she never loved Baxter, and as he fell unconscious he called her a liar. Patsy was more honest with herself as the police dragged Baxter off to prison.

(Avengers Spotlight I#22-25) - Crossfire, wanting revenge on Hawkeye, offered several super-villains one million dollars to bring him one of Hawkeye's arms. After the Brothers Grimm weakened Hawkeye, Baxter attacked and quickly bit Hawkeye's arm, releasing toxins into Hawkeye's system. Baxter and Hawkeye toppled over a roof, then Bobcat arrived and engaged in battle with Baxter over which one of them got to claim Hawkeye's arm. They came to their senses and chased after Hawkeye, who stalled them with a tear-gas arrow. Later, Baxter cornered Hawkeye in the sewer with the Death-Throws, Crossfire, Razorfist, the Brothers Grimm, Bullet Biker, and Bobcat. Hawkeye was joined by Trick Shot and Mockingbird, and a battle erupted. Baxter was quickly knocked aside by Mockingbird and was not seen for the rest of the battle.

(Fantastic Four I#335) - Reacting to a machine made by Doctor Doom that placed suggestions in the minds of several criminals, Baxter attacked the Fantastic Four alongside the Eel, Thunderball, and the Vanisher at Congress. When Baxter was accidentally hit with Thunderball's weapon, he turned on Thunderball. Ms. Marvel ripped them apart and turned them over to the police.

(Alpha Flight I#111) - While hiding out in Toronto , Baxter was caught up in the violent influence of the release of the Sk'ar (who mentally influenced him to do battle). He fought Windshear and Gamma Flight, primarily battling Manikin's caveman form. When another villain, Firebug, exploded, Baxter was rescued by Manikin's future self teleporting Baxter out. Though the battle continued, Baxter was long gone.

(Nick Fury: Agent of S.H.I.E.L.D. III#35 (fb)) - Roxxon Oil hired Angar the Screamer and Baxter to lead a group of operatives in a two-fold mission: infiltrate the S.H.I.E.L.D. Helicarrier and access S.H.I.E.L.D.'s files for Roxxon, and then to destroy S.H.I.E.L.D. completely. If the mission was successful, they agreed to cure Baxter of being Mad Dog. Baxter and Angar recruited Overrider, Smokescream, Assault and Battery, and Ivory (who later betrayed them) for the mission.

(Nick Fury: Agent of S.H.I.E.L.D. III#32-35) -The villains stormed the S.H.I.E.L.D. Helicarrier, captured several agents, and then shanghaied the Helicarrier away by teleporting it to a new location. They quickly learned that accessing the S.H.I.E.L.D. files would cause them to auto-delete, and that the Helicarrier would soon self-destruct. Baxter tried to trick Fury into releasing the right codes by ‘assassinating' an LMD of Dum-Dum Dugan, but Fury didn't fall for it. When Nick Fury, GW Bridge, and the new Super-Agents of S.H.I.E.L.D. (Knockabout, Psi-borg, and Violence) eventually found the Helicarrier and attacked, the villains joined them in battle. Mad Dog battled with, and was defeated by, Violence. The entire villain coup was soon dismantled.

(Captain America I#411) - Baxter agreed to fight Crossbones as the first of five competitors at a super-villain convention on Boca Caliente (AIM Island), winning half a million dollars if he triumphed. Baxter was unaware that the Crossbones he was fighting was actually Captain America in disguise. While hundreds of super-villains cheered him on, Baxter got trapped in a hold, and Baxter dislocated his own shoulder to get out of it. He tried to bite ‘Crossbones,' but it didn't break the skin. ‘Crossbones' made Baxter hit himself several times, then smashed his face into the ground. An unconscious Baxter was carried offstage. ‘Crossbones' also fought Ramrod, General Wo, Razorfist, and Batroc.

(Captain America I#412-414 - BTS) - Presumably Baxter was present when Captain America, Diamondback, Falcon, and Shang-Chi battled numerous super-villains on the island. Presumably Baxter escaped.

(Siren Infinity) - While working with the Taskmaster, Baxter was sent to test the skills of Siren, an Ultraverse resident on mainstream Earth. Though Baxter held his own initially, she flattened Baxter with a single punch (she may have used her powers to mentally influence him).

(Nomad: Girl Without A World#2 (fb) - BTS) - Baxter got married to Rachel Ford while still working for the Secret Empire. After failing on a mission he was further mutated as punishment, leaving him trapped in a feral weredog-like state. Rachel soon found happiness in the arms of another man.

(Captain America V#602/2 (fb) - BTS) - Rachel remained unaware of her husband's predicament.

(Captain America V#604/2 (fb) - BTS) - The Secret Empire paid Rachel a monthly stipend through an ad agency.

(Nomad: Girl Without A World#1) - While investigating a mysterious group of students Bucky (Rikki Barnes) followed fellow student Natsuki Ozawa to a secret underground base at Aiken Garvey High School she was attacked by Mad Dog. He ripped into her with his claws, but she escaped with her life.

(Nomad: Girl Without A World#2) - Mad Dog sat in a corner at Professor Power's underground base. Power was afraid of the Secret Empire's punishment for them if they failed in their current mission because of Nomad. Mad Dog already knew enough about the way the Secret Empire punished their agents for failure and remembered his wife leaving him after he was forcefully mutated into a weredog. Professor Power and Mad Dog watched footage of Nomad's fight with Flag-Smasher and Power recognized her as his student Rikki Baines.

(Nomad: Girl Without A World#3) - Professor Power and Mad Dog attacked Nomad while she was patrolling the streets. Taking her by surprise on a roof they captured her. Mad Dog was surprised when Professor Power brainwashed Nomad to use her to further their mission and humiliate her at the same time.

   Mad Dog and Nomad were present when Professor Power reported the status of his brainwashing experiment to his superiors at the Secret Empire. They believed Power's use of Nomad could have skewered the results of the experiment and demanded of him to kill Nomad.

(Nomad: Girl Without A World#4) - While Mad Dog and Professor Power watched the riots started by Matthew Surman, one of his conditioned students, Nomad escaped her restraints. Nomad escaped after knocking both of them out.

   Mad Dog was present when Professor Power reported to the Secret Empire, who ordered Power and Mad Dog to destroy their current base as soon as the Secret Empire had cloned Power's system. They also ordered them to return to the Secret Empire's island to answer for their failures including the escape of Nomad and the riots caused by Power's system that could reveal the Secret Empire's presence. Power, who considered his process a failure, was neither going to allow the Secret Empire to duplicate it nor let himself and Mad Dog be punished for their supposed failures. Power asked Mad Dog if he wanted to destroy everything at their base right now and he agreed to.

   While on the run from the Secret Empire Professor Power was caught at Stan's Easy/Go gas station. Mad Dog escaped into the nearby woods on his own.

(Captain America V#602/2) - Hoping Mad Dog would return to his wife Rachel Nomad kept kept her under surveillance. One night Mad Dog stepped from an alley talk to his wife, but Nomad he was confronted by Nomad, who knew Buzz didn't want to hurt Rachel. Everything got out of control when Araña attacked Mad Dog out of nowhere. Mad Dog hurled her at Nomad and escaped into the sewers. When the young heroines were gone Rachel called the Secret Empire to tell them the Mad Dog had found her and was followed by Nomad and another heroine. When she asked them why Nomad called Mad Dog by Baxter's name they assured her the Mad Dog was not Baxter, but just a confused creature. As soon as Professor Power was informed about Mad Dog's re-appearance he vowed to retrieve him even though Nomad and Araña were in pursuit.

   Mad Dog suddenly appeared behind Nomad and Araña in the sewers and attacked them. Drones sent by the Secret Empire knocked Mad Dog out with an energy blast.

(Captain America V#603/2) - While Nomad and Araña fought two drones the others took the unconscious Mad Dog back to the Secret Empire's sewer base. A scientist sent in by the Secret Empire added a new catalyst to further enhance Mad Dog's mutation. It was an unnecessarily painful process.

(Captain America V#604/2) - Nomad and Araña followed a lead to an ad agency, but it was a trap. While Nomad got trapped in an office, which was filling up with poison gas, Araña was attacked by Mad Dog outside the office. Araña lured Mad Dog to punch through one of the armored windows of the office trap before knocking him out with a fire extinguisher. Araña pulled Mad Dog's fist from the window, then climbed through the hole to save Nomad.

(Heroic Age: Villains) - Steve Rogers reviewed reports on Mad Dog and was concerned how far he had malformed, but considered him a possible candidate for Luke Cage's Thunderbolts program to reform super-powered villains.

SECRET WARS III HAPPENED

(Patsy Walker, A.K.A. Hellcat#9) - Hedy Wolfe sought out Mad Dog, convincing him that Hellcat possibly had a cure for his mutated condition, so he attacked her and her friends, Jubilee, Sharon King, Tom Hale, and Ian Soo. Son of Satan also attacked, sending Patsy to another dimension.

(Patsy Walker, A.K.A. Hellcat#10) - Mad Dog and Son of Satan helped defeat the demon Belial, then apologized to Patsy for their confusion and departed.

(Patsy Walker, A.K.A. Hellcat#17) - Mad Dog went shopping at the mall.

(Amazing Spider-Man V#18 (fb) - BTS) - Mad Dog was captured by Taskmaster and Black Ant, for Kraven the Hunter and Arcade, then placed in Central Park under a force field along with dozens of super-villains, only to be hunted by Hunter-Bots.

(Amazing Spider-Man V#18) - Mad Dog got shot in the chest with several arrows by a Hunter-Bot.

(Amazing Spider-Man V#19) - He reverted to his human form after his apparent death and was found dead by Spider-Man alongside other dead villains.

(Iron Man/Hellcat Annual#1 (fb) - BTS) - Buzz Baxter went to Hell and formed an alliance with Blackheart. They sent Blood Scourges to Earth to abduct Hedy Wolfe to lure Hellcat to Hell.

(Iron Man/Hellcat Annual#1) - Their plan worked and Hellcat was sent to Hell by her stuffed bunny (secretly Hellstorm) to save Hedy. Patsy met the souls of her family in a replica of her later mother's house and Buzz approached her. When she decided to leave he stopped her and transformed into his Mad Dog form. They fought and Mad Dog revealed that he and his partner had brought Hedy to Hell to lure Patsy into this trap. Blackheart revealed himself as Mad Dog's partner and explained that all the souls of Patsy's family were encased inside him because Patsy's mother had promised Patsy to his father, a deal Hellcat had reneged on. Iron Man came to Hellcat's aid, but Blackheart was too powerful for both of them. Mad Dog kicked Hellcat while asking her to be reasonable and join him in Hell where she belonged. She used her claws to rip the trapped souls from Blackheart and escaped Hell with Iron Man and the spirits of her family.

Comments: Baxter adapted for Marvel Comics by Steve Englehart, Tom Sutton, and Frank Giacoia. Adapted to Mad Dog by J.M. DeMatteis, Don Perlin, and Kim DeMulder.

Part of the premise of Patsy (Hellcat) Walker's character is that she was ‘immortalized' by her mother in a series of comic books about Patsy and her friends. While there is no doubt that Marvel released a line of these comic books, I have no idea whether or not Buzz Baxter was really a part of them. In Avengers I#144, Baxter leaving for Vietnam was referenced to Patsy Walker I#123. Regardless of those appearances, they aren't considered ‘Marvel canon' and can be seen as ‘fictional' works within the ‘real' MU. This profile, then, is obviously to document Baxter's appearances in the real MU which, while rather peripheral, spans 30 years.

According to "The Timely Comics History" , Buzz debuted back in Miss America Magazine#2 (November, 1944) along with his rival girlfriends Patsy Walker and Hedy Wolfe.
--Dim I Nticoudis

Baxter was obviously changed into Mad Dog as a foil to Hellcat. His appearances paint him at times as hesitant and remorseful, and deadly and vengeance-seeking, as savage and mindless, and even as repentant. I think it is safe to say that he's nuts. Originally created as a foil to Patsy Walker, and then to Hellcat, Mad Dog quickly became another MU super-villain-for-hire, making appearances only every few years working for a new big boss/evil mastermind.

Tails of the Pet Avengers#1/4 tells the story where Mad Dog was once more recruited by Roxxon to use their wrist-mounted teleport matrix to covertly arrive in Attilan on the moon with the objective of stealing a sample of Terrigen mist to aid Roxxon furthering their gene-splicing techniques. Mad Dog stole one of the rod-like canisters and teleported away, but Lockjaw was already alert and pursued him, teleporting into the Roxxon lab. Confronted by a very large dog like Lockjaw unleashed Baxter's primal instinct and a growling dogfight ensued, with Mad Dog attempting to take the canister away from Lockjaw using his teeth. Mad Dog was thrown against the teleport generator, which exploded, and Baxter ran away whimpering with his tail on fire. This Attilan adventure was set when the Inhuman city was still on the moon. This was not the first time that Roxxon interfered with the Inhumans.
However, it should be noted that Pet Avengers are not considered canon.---Madison Carter
As with everything, that is subject to change if new stories bring forth info to the contrary.---Snood

He was probably one of the many unidentifiable villains seen at the end of Amazing Spider-Man V#16 (April, 2019) trapped in energy cages on a mountainside in South Africa, but we don't know for sure.

Mad Dog received profiles in Official Handbook of the Marvel Universe Deluxe Edition#7 (June, 1986) and Defenders: Strange Heroes (February, 2012).

Profile by Chadman.

Updated by Markus Raymond (Nomad & Captain America V).

Clarifications:
Mad Dog (Buzz Baxter) has no known connections to:

• Mr. Baxter - designer of Ulvar--Journey Into Mystery I#63
• Abigail Baxter - wife of Noah Baxter--Fantastic Four III#36
• Joseph Baxter - defeated Ozamm--Tales to Astonish I#39/2
• Noah Baxter - builder of Baxter Building--Fantastic Four III#36
• Dog - half-brother of Wolverine--Origin I#1
• Dog - of China Force--Alpha Flight I#69
• Dog - Ultraverse assassin--Ultraforce II#5
• Dog O'War - Earth-Dystopia--Incredible Hulk: Future Imperfect I#1
• Dog O'War (and Dogs O'War) - Earth-NU--Justice (NU) I#32
• Dogs of War - agents of Simon Krueger--Iron Man: Iron Age I#2
• Dogs of War - Warhawks--Hercules: Heart of Chaos I#1
• Dogs of War - the Hatut Zeraze--Black Panther III#4
• Dogs of War - 2099 AD, Doom's soldiers--2099: World of Tomorrow I#4
• Mad Dog #336 - aka Spider-Man--Amazing Spider-Man I#295
• Mad Dog #736 - aka Captain Zero--Amazing Spider-Man I#295
• Mad Dog #2020 - aka Brainstorm--Web of Spider-Man I#33
• Mad Dog Martin - of Deadly Dozen--Combat Kelly and his Deadly Dozen I#6
• Mad Dog Rassitano - of Code: BLUE--Thor I#426
• Mad Dog Ward - created other Mad Dog numbers, funded by Kingpin--Web of Spider-Man I#33
• any other characters not mentioned in this profile

Mr. Grant