Pet Eggs were first released during the Eggstravaganza during April. There were originally 3 pets, the Falcon, Chick, and Crocodile. Since then, 3 more pets have been added, in order of release: Platypus, Echidna, and the Crow.
You have to wait 3 days for the egg to hatch, and you probably won’t get the one you want. Is paying 3 Diamonds (a Diamond every day) really worth it? Maybe if you have like 56 Diamonds, then maybe you’ll buy 2 or 3.
Recently, I got a Pet Echidna and a Pet Platypus on the same day, so it’s cool... I guess..