Please include as much of the following information as possible to help me fix the bug:

If you are reselling vanity pets they don't always show in the interface as multiples.

debug mode does not show them as having an ID

Please include a brief description of the bug, including what you were doing, and when it occurred.

purchase a pet from a vendor, the exotic pet vendor in nether storm is a good one. "learn the pet" then right click on in in your collection and select "put in cage" now purchase another but don't learn it. go to AH and hover over each of the pets with auctionator open in sell mode. The pets are the same, same level, they should come up with the same ID.

Loaded Addons

AckisRecipeList
AckisRecipeList_Blacksmithing
AckisRecipeList_Cooking
AckisRecipeList_Leatherworking
Altoholic
Altoholic_Achievements
Altoholic_Agenda
Altoholic_Characters
Altoholic_Grids
Altoholic_Guild
Altoholic_Search
Altoholic_Summary
Auctionator
BittensSpellFlash_Rogue
BrokerPets
Broker_Everything
ChocolateBar
ChocolateBar_Options
DBM-AQ20
DBM-AQ40
DBM-BWL
DBM-BaradinHold
DBM-BastionTwilight
DBM-BlackTemple
DBM-BlackrockFoundry
DBM-BlackwingDescent
DBM-Brawlers
DBM-BrokenIsles
DBM-ChamberOfAspects
DBM-Coliseum
DBM-Core
DBM-DMF
DBM-DefaultSkin
DBM-Draenor
DBM-DragonSoul
DBM-EmeraldNightmare
DBM-EyeOfEternity
DBM-Firelands
DBM-GUI
DBM-GarrisonInvasions
DBM-HeartofFear
DBM-HellfireCitadel
DBM-Highmaul
DBM-Hyjal
DBM-Icecrown
DBM-Karazhan
DBM-MC
DBM-MogushanVaults
DBM-Naxx
DBM-Nighthold
DBM-Onyxia
DBM-Outlands
DBM-Pandaria
DBM-Party-BC
DBM-Party-Cataclysm
DBM-Party-Classic
DBM-Party-Legion
DBM-Party-MoP
DBM-Party-WoD
DBM-Party-WotLK
DBM-PvP
DBM-Scenario-MoP
DBM-Serpentshrine
DBM-SiegeOfOrgrimmarV2
DBM-StatusBarTimers
DBM-Sunwell
DBM-TerraceofEndlessSpring
DBM-TheEye
DBM-ThroneFourWinds
DBM-ThroneofThunder
DBM-Ulduar
DBM-VoA
DBM-WorldEvents
DataStore
DataStore_Achievements
DataStore_Agenda
DataStore_Auctions
DataStore_Characters
DataStore_Containers
DataStore_Crafts
DataStore_Currencies
DataStore_Garrisons
DataStore_Inventory
DataStore_Mails
DataStore_Pets
DataStore_Quests
DataStore_Reputations
DataStore_Spells
DataStore_Stats
DataStore_Talents
GoGoMount
GuildGreet
IceHUD
IceHUD_Options
Informant
IskarAssist
MasterPlan
MasterPlanA
MountFarmHelper
Postal
Recount
SlideBar
SpellFlash
SpellFlashCore
Storyline
Stubby
TidyPlates
TidyPlatesHub
TidyPlatesWidgets
TidyPlates_ClassicPlates
TidyPlates_Graphite
TidyPlates_Grey
TidyPlates_Neon
TidyPlates_Quatre
Include a list of addons you were running at the time this bug occurred.

Back Trace (LUA Error Output)

Not really a Bug, the addon does not crash. More of a missed feature?
You can get this through the use of !BugGrabber and BugSack addons.

This would require coding or a dedicated library to differentiate between caged pets and wild caught / non caged but BOE sellable pets. While they have the same name, the coding from Blizzard does not easily lead to differentiating the IDs between the two.

this has been a debate for a long time and may need to be something that is brought up in future builds as nothing has been usefully added in 7.0 to simplify pet identification.

Marking s enhancement request