The "Goat Monk" hybrid pet is the most rare pet in the game. It is hatched from a sheep and another random pet. The sheep is already almost impossible to get, as you have to be a staff member to get it; and another thing is that you will be lucky to hatch with the sheep from the few/many staff members.
i disagree with this, they are a common item from many card packs, i have 6
I don't exactly have six, but yes, I was going to say, I got a seraph from a pack and it said "rare" not "ultra-rare" or anything like that (and I have discovered that the "rare" pets are actually more common than I myself would call "rare")
Grace Dreamrider on Feb 2, 2014 wrote: i disagree with this, they are a common item from many card packs, i have 6 Same. I just got a seraph from a card pack on my first time trying. I'm not cutting anyone down but I don't think there is a rarest pet, since all pets can be hatched, dropped or bought. Except the sheep. No one can get that pet because it's for members of KI and if they send you one.