1843 pets
Hiss
Hiss
Vs. 
Critter
Vs. 
Flying
Adder
Pet Battle: [1-2] Dun Morogh; [1-2] Durotar; [3-4] Northern Barrens; [7-9] Northern Stranglethorn; [9-10] Southern Barrens; [16-17] Blasted Lands; [17-18] Hellfire Peninsula; [18-19] Nagrand (Outland); [25] Spires of Arak; [25] Nagrand (Draenor)
(unlimited supply) Archetype of Cunning — [Archetype of Cunning]
Shadowlands Profession: Protoform Synthesis
Taught By: [Archetype of Cunning]
Beetle
Pet Battle: [3-6] Darkshore; [4-6] Ashenvale; [7-9] Northern Stranglethorn; [9-10] The Cape of Stranglethorn; [13-14] Badlands; [14-15] Felwood; [15-16] Un'Goro Crater; [16-17] Silithus
Bonebiter — [Bonebiter]
Cavern Moccasin — [Cavern Moccasin]
Quest: Pet Battle Challenge: Wailing Caverns [45]
Zone: Northern Barrens
Drop: Damp Pet Supplies
Approximate Drop Rate: Unknown
Cobra Hatchling — [Cobra Hatchling]
Drop: Mysterious Egg after 3 days becomes [Cracked Egg]
Contains: 1 in 5 options
Cockroach
Pet Battle: [1-2] Durotar; [6-7] Wetlands; [11-12] The Hinterlands; [15-16] Burning Steppes; [15-16] Un'Goro Crater; [22-23] Icecrown; [23-24] Twilight Highlands; [25] Gorgrond
Crimson Snake — [Crimson Snake]
Vendor: Dealer Rashaad
Zone: Netherstorm
Cost: 50
(unlimited supply)
Vendor: Xan'tish
Zone: Orgrimmar
Cost: 50 (unlimited supply)
Deathsting Scorpid — [Deathsting Scorpid]
Scenario: Island Expeditions
Approximate Drop Rate: Unknown
Emerald Boa
Pet Battle: [3-4] Northern Barrens; [9-10] Southern Barrens; [15-16] Un'Goro Crater; [23-24] Uldum
Fire Beetle
Pet Battle: [13-14] Searing Gorge; [15-16] Un'Goro Crater; [15-16] Burning Steppes; [16-17] Blasted Lands; [22-23] Mount Hyjal
