There's a new feature on the pet pages.
If you're viewing your pet, it'll display a list of other pets that have the same adopter name as the pet you're looking at. This'll let you see other pets on your collections! . Here's my dog:
http://www.chickensmoothie.com/viewpet.php?id=346
(I should pick a more unique name than 'Nick'! The only other pets there that are mine are "Dog" and "Dot".. ).