| 0 | - | cover | 1 | pencils: Humberto Ramos; inks: Humberto Ramos; colors: Jeremy Roberts | Niels, Lockheed, Lockjaw, Ms. Lion, Redwing, Throg, Simon Walterson, Zabu |
| 1 | Collected Editions | promo (ad from the publisher) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Karl Kerschl | Lockjaw; Throg; Lockheed; Redwing; Hairball; Devil Dinosaur |
| 2 | Credits | credits, title page | 2 | letters: typeset | |
| 3 | - | cover reprint (on interior page) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Romain Gaschet | Lockjaw; Throg; Lockheed; Redwing; Hairball |
| 4 | The Infinity Gems | comic story | 22 | script: Chris Eliopoulos; pencils: Ig Guara, Colleen Coover; inks: Ig Guara, Colleen Coover; colors: Chris Sotomayor, Colleen Coover; letters: Blambot, Nate Piekos | Pet Avengers [Lockjaw; Throg [Simon Walterson] (origin); Lockheed; Redwing; Hairball [Niels] (Speedball's Cat)]; Ms. Lion; Mr. Fantastic; Invisible Woman; Black Bolt; Medusa; Gorgon; Karnak; Crystal; CAMEO FLASHBACK: Thanos; Thor (as a Frog); Puddlegulp |
| 5 | - | cover reprint (on interior page) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Karl Kerschl | Lockjaw; Throg; Lockheed; Redwing; Hairball; Devil Dinosaur |
| 6 | We Are Simple Creatures on a Monumental Quest | comic story | 22 | script: Chris Sotomayor; pencils: Ig Guara; inks: Ig Guara; colors: Chris Sotomayor; letters: Blambot, Nate Piekos | Pet Avengers [Lockjaw; Throg [Simon Walterson]; Lockheed; Redwing; Hairball [Niels] (Speedball's Cat); Zabu; Ms. Lion]; Devil Dinosaur; CAMEO FLASHBACK: Thanos |
| 7 | - | cover reprint (on interior page) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Karl Kerschl | Lockjaw; Throg; Lockheed; Redwing; Hairball; Devil Dinosaur |
| 8 | We Are a Band of Brothers | comic story | 23 | script: Chris Sotomayor; pencils: Ig Guara; inks: Ig Guara; colors: Chris Sotomayor; letters: Blambot, Nate Piekos | Pet Avengers [Lockjaw; Throg [Simon Walterson]; Lockheed; Redwing; Hairball [Niels] (Speedball's Cat); Zabu; Ms. Lion]; Bo; Giganto; Thanos |
| 9 | - | cover reprint (on interior page) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Karl Kerschl | Lockjaw |
| 10 | - | comic story | 23 | script: Chris Eliopoulos; pencils: Ig Guara; inks: Ig Guara; colors: Chris Sotomayor; letters: Blambot, Nate Piekos | Pet Avengers [Lockjaw; Throg [Simon Walterson]; Lockheed; Redwing; Hairball [Niels] (Speedball's Cat); Zabu; Ms. Lion]; Bo; Thanos; Mr. Fantastic; Black Bolt |
| 11 | - | cover reprint (on interior page) | 1 | pencils: Humberto Ramos; inks: Humberto Ramos; colors: Jeremy Roberts | Lockjaw; Throg; Zabu; Lockheed; Hairball; Redwing; Ms. Lion |
| 12 | Beginnings and Endings | comic story | 5 | script: Chris Eliopoulos; pencils: Ig Guara; inks: Ig Guara; colors: Chris Sotomayor; letters: Dave Sharpe | Throg; Zabu (cameo flashback); Redwing (cameo flashback); Thanos (cameo flashback) |
| 13 | My Enemy, My Friend | comic story | 5 | script: Chris Eliopoulos; pencils: Chifuyu Sasaki, Gurihiru; inks: Chifuyu Sasaki, Gurihiru; colors: Naoko Kawano, Gurihiru | Zabu |
| 14 | Terrier on the High Seas | comic story | 5 | script: Colleen Coover; pencils: Colleen Coover; inks: Colleen Coover; colors: Colleen Coover; letters: Colleen Coover | Ms. Lion; Aunt May Parker |
| 15 | Top Dog | comic story | 5 | script: Scott Gray; pencils: Chifuyu Sasaki, Gurihiru; inks: Chifuyu Sasaki, Gurihiru; colors: Naoko Kawano, Gurihiru; letters: Dave Sharpe | Lockjaw; Mad-Dog [Buzz Baxter]; Oberoth; Dr. Hammond; Dr. Edwards |
| 16 | Prom Queen | comic story | 5 | script: Buddy Scalera, Chris Eliopoulos; pencils: Chris Eliopoulos; inks: Chris Eliopoulos; colors: Chris Garcia; letters: Chris Eliopoulos | Lockheed; X-Men [Cyclops; Wolverine; Colossus](cameo flashback) |
| 17 | Birds of a Different Feather | comic story | 5 | script: Joe Caramagna; pencils: Colleen Coover; inks: Colleen Coover; colors: Colleen Coover; letters: Colleen Coover | Redwing; Falcon; Melvin |
| 18 | Marvel Pets Handbook cover | cover reprint (on interior page) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Karl Kerschl | Giganto; Devil Dinosaur; Redwing; Lockheed; Lockjaw; Niels; Cosmo; Tippy Toe; Old Lace; Watchdog; Zabu; Ebony; Valinor; Toothgnasher; Toothgrinder; ants; Peotor [Super-Ape] |
| 19 | Marvel Pets Handbook Credits | credits, title page | 1 | letters: typeset | |
| 20 | Why? : A Brief History of Marvel Pets | foreword, introduction, preface, afterword | 1 | script: Michael Hoskin; pencils: John Romita, Ig Guara; inks: John Romita, Ig Guara; colors: Chris Sotomayor | |
| 21 | Aragorn | character profile | 1 | script: Michael Hoskin; pencils: John Buscema | |
| 22 | Brightwind | character profile | 1 | script: Jacob Rougemont; pencils: June Brigman, Mike Wieringo, Bret Blevins | |
| 23 | Cerberus | character profile | 1 | script: Michael Hoskin; pencils: Jack Kirby, Mark Texeira | |
| 24 | Collector's Creatures | character profile | 2 | script: Sean McQuaid; pencils: Steve Epting, Paul Neary, John Buscema, Dave Wenzel, Bob Brown | |
| 25 | Cosmo | character profile | 1 | script: Chris Biggs; pencils: Brad Walker | |
| 26 | Devil Dinosaur | character profile | 2 | script: Stuart Vandal; pencils: Jack Kirby, Eric Powell; inks: Mike Royer, Eric Powell | |
| 27 | Garm | character profile | 1 | script: Gabriel Shechter; pencils: Walter Simonson; inks: Walter Simonson | |
| 28 | Giganto | character profile | 1 | script: Madison Carter; pencils: Jack Kirby, Seth Fisher, Lee Weeks, Ron Lim, Jason Armstrong, Bill Sienkiewicz | |
| 29 | Hellstorm's Demon-Steeds | character profile | 1 | script: Jeff Christiansen; pencils: Jim Mooney, Bernie Wrightson, Peter Gross | |
| 30 | Lobo | character profile | 1 | script: Michael Hoskin; pencils: John Buscema, Harvey Tolibao, Javier Saltares | |
| 31 | Lockheed | character profile | 1 | script: Eric J. Moreels; pencils: Dave Hoover, Alan Davis | |
| 32 | Lockjaw | character profile | 1 | script: Mark O'English; pencils: John Byrne; inks: John Byrne | |
| 33 | Mole Man's Monsters | character profile | 3 | script: Madison Carter; pencils: Jack Kirby, Art Adams, Roger Langridge, Chris Weston, John Cassaday, Joe Quesada | |
| 34 | Outcasts | character profile | 1 | script: Gabriel Shechter; pencils: Al Milgrom; inks: Al Milgrom | |
| 35 | Red Ghost's Super-Apes | character profile | 1 | script: Michael Hoskin; pencils: John Byrne, George Tuska; inks: John Byrne | |
| 36 | Redwing | character profile | 1 | script: Jacob Rougemont; pencils: Ivan Reis | |
| 37 | Toothgnasher & Toothgrinder | character profile | 1 | script: Gabriel Shechter; pencils: Andrea Di Vito; inks: Andrea Di Vito | |
| 38 | Valinor | character profile | 1 | script: Michael Hoskin; pencils: Keith Pollard, M. C. Wyman; inks: Keith Pollard | |
| 39 | Vixen | character profile | 1 | script: Stuart Vandal; pencils: Alan Davis | |
| 40 | Zabu | character profile | 1 | script: Michael Hoskin; pencils: Brent Anderson; inks: Brent Anderson | |
| 41 | Ant-Man's Ants | character profile | 0.5 | script: Ronald Byrd; pencils: Bob Layton; inks: Bob Layton | |
| 42 | Ape | character profile | 0.5 | script: Michael Hoskin; pencils: Herb Trimpe; inks: John Severin | |
| 43 | The Beasts of Berlin | character profile | 0.5 | script: Sean McQuaid; pencils: Dick Ayers | |
| 44 | Bill & Don | character profile | 0.5 | script: Mike O'Sullivan; pencils: Kerry Gammill | |
| 45 | Blaze the Wonder Collie | character profile | 0.5 | script: Ronald Byrd | |
| 46 | Cr'Reee | character profile | 0.5 | script: Eric J. Moreels; pencils: Dave Cockrum | |
| 47 | Currs | character profile | 0.5 | script: Rob London; pencils: Renato Arlem | |
| 48 | Deuce | character profile | 0.5 | script: Markus Raymond; pencils: Cary Nord | |
| 49 | Diablo | character profile | 0.5 | script: Michael Hoskin | |
| 50 | Dreamstalker | character profile | 0.5 | script: Markus Raymond; pencils: Marie Severin | |
| 51 | Droog | character profile | 0.5 | script: Jeff Christiansen; pencils: Herb Trimpe | |
| 52 | Ebony | character profile | 0.5 | script: Michael Hoskin; pencils: Jack Kirby | |
| 53 | Freki and Geri | character profile | 0.5 | script: David Wiltfong; pencils: John Buscema | |
| 54 | The Frogs of Central Park | character profile | 0.5 | script: Gabriel Shechter; pencils: Walter Simonson; inks: Walter Simonson | |
| 55 | Hellcow | character profile | 0.5 | script: Jeff Christiansen; pencils: Frank Brunner | |
| 56 | Hellhorse | character profile | 0.5 | script: Michael Hoskin; pencils: Jack Kirby, George Tuska | |
| 57 | Ina and Biri | character profile | 0.5 | script: Michael Hoskin; pencils: Jim Steranko; inks: Jim Steranko | |
| 58 | Kerberos | character profile | 0.5 | script: Michael Hoskin; pencils: Takeshi Miyazawa; inks: Takeshi Miyazawa | |
| 59 | Kraven the Hunter's Menagerie | character profile | 0.5 | script: Michael Hoskin; pencils: Steve Ditko, John McCrea; inks: Steve Ditko | |
| 60 | Krill | character profile | 0.5 | script: Michael Hoskin; pencils: Mike Deodato Jr.; inks: Mike Deodato Jr. | |
| 61 | Man-Oo | character profile | 0.5 | script: Michael Hoskin | |
| 62 | Max | character profile | 0.5 | script: Michael Hoskin; pencils: Gary Kwapisz | |
| 63 | Monkey Joe | character profile | 0.5 | script: Sean McQuaid; pencils: Paul Pelletier | |
| 64 | Munin and Hugin | character profile | 0.5 | script: David Wiltfong; pencils: Marko Djurdjević; inks: Marko Djurdjević | |
| 65 | Niels | character profile | 0.5 | script: Mike O'Sullivan; pencils: Steve Ditko | |
| 66 | Nimo | character profile | 0.5 | script: Michael Hoskin | |
| 67 | Old Lace | character profile | 0.5 | script: Madison Carter; pencils: Michael Ryan | |
| 68 | Preyy | character profile | 0.5 | script: Markus Raymond; pencils: Sal Velluto, Patrick Zircher | |
| 69 | Princess Python's Pythons | character profile | 0.5 | script: Ronald Byrd; pencils: Sal Buscema | |
| 70 | Puppy | character profile | 0.5 | script: Mark O'English; pencils: Salvador Larroca | |
| 71 | Saint | character profile | 0.5 | script: Ronald Byrd; pencils: Gene Colan; inks: Tom Palmer | |
| 72 | Sassafrass | character profile | 0.5 | script: Eric J. Moreels; pencils: Don Perlin | |
| 73 | Sleipnir | character profile | 0.5 | script: David Wiltfong; pencils: Victor Olazaba | |
| 74 | Strider | character profile | 0.5 | script: Michael Hoskin; pencils: Pasqual Ferry | |
| 75 | Tippy-Toe | character profile | 0.5 | script: Sean McQuaid; pencils: Matt Haley | |
| 76 | Valkyrior Steeds | character profile | 0.5 | script: Michael Hoskin; pencils: Walter Simonson, Art Adams | |
| 77 | Watchdog | character profile | 0.5 | script: Michael Hoskin; pencils: Jae Lee, John Romita Jr. | |
| 78 | Zar | character profile | 0.5 | script: Michael Hoskin; pencils: Ben Thompson | |
| 79 | Appendix: Cowboy Horses of the Old West | character profile | 1 | script: Michael Hoskin | |
| 80 | Appendix: Miscellaneous Pets | character profile | 3 | script: Michael Hoskin | |
| 81 | - | cover reprint (on interior page) | 1 | pencils: Niko Henrichon; inks: Niko Henrichon; colors: Niko Henrichon | Thor; Throg |
| 82 | - | cover reprint (on interior page) | 1 | pencils: Niko Henrichon; inks: Niko Henrichon; colors: Niko Henrichon | Lockheed; Wolverine; Kitty Pryde |
| 83 | - | cover reprint (on interior page) | 1 | pencils: Niko Henrichon; inks: Niko Henrichon; colors: Niko Henrichon | Lockjaw; Hairball; Spider-Man [Peter Parker]; The Thing [Ben Grimm] |
| 84 | - | cover reprint (on interior page) | 1 | pencils: Niko Henrichon; inks: Niko Henrichon; colors: Niko Henrichon | Redwing; Captain America; Falcon |
| 85 | Deadpool Variant | cover reprint (on interior page) | 1 | pencils: Chris Eliopoulos; inks: Chris Eliopoulos; colors: Chris Eliopoulos | Lockjaw (as Deadpool); Throg (as Deadpool) |
| 86 | Pet Avengers Assemble! | promo (ad from the publisher) | 1 | pencils: Karl Kerschl; inks: Karl Kerschl; colors: Karl Kerschl | Lockjaw; Throg; Lockheed; Redwing; Hairball; Giganto |