I collected many pets during Cataclysm as a preparation for MoP Pet battles. Before the prepatch was released I had 132 pets, but many of them got duplicated. E.g. my tiny whelplings and other rare pets are now duplicated. I think unique pets like the Kirin Tor Familiar are not duplicated. Currently, I assume that the duplicates will be removed, which unfortunately makes it currently inconvenient to level pets for Pandaria, as you can’t recognise the duplicates unless you had previously marked a pet as a favourite. Therefore, I recommend all fellow pet collectors to avoid selling or buying at the auction house for now.
Same. Have 2x of nearly every pet
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i had 2 spriter dartlings which were rare, i had 2 willies and 2 speedys from childrens week, i didnt even consider it could be a bug i just didnt think about it, but yeah i had a lot of duplicates
Time to sell some rare pets huh…hmm 
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i actually caged the blue rares i could that i and thinking damn i must have gotten 2…
and now i think back on it i had 2 Ice Chips on diff chars from the elune dungeon, but i only had 1 Frigid Frostling when i logged in, will see what happens when its patched out soon and hopefully fixed…
i dont know how blizz do items but ive worked in small game dev and with items having ID numbers so finding clones is fairly easy, but ive levelled 1 of my clones, if one is deleted i hope its not the one ive levelled lol
ohh…damn. Did not think about that!! FFFFFF dont want a reroll on my pets 
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Huh so that’s what’s going on? I was surprised and wondering why I suddenly had double of each Pet I ever got including my Archeology pets