you're not the only one with the problem - i assume your caged pets are in the guild vault rather than your personal bank.
Issue is that blizzard only returns the item id of the cage and not the pet when items are in the guild vault - so there is no way for warehousing to find the right item to move
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sic> I love you all. TSM Has given me children.
sic> That is all.
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MuffinPvEHero> and I agree with Bart39
TSM Application Developer / Assistant Addon Developer