Is this a legit registry? I bought a Bengal from a petstore and only received papers for that registry.

You don't need to keep double-posting things. People will find them. And really, in the bigger scheme of things, it's not really an IMPORTANT QUESTION. I have no idea of the legitimacy of unitedregistry, it's certainly not one of the better known ones, but c'mon, you bought your bengal at a pet store. A diligent breeder who is meticulous about things like selective breeding, ancestry, socialization, health care, and nutrition is not going to be selling their kittens at a pet store. You simply can't expect the same standards. You probably got a really nice cat, that should be the focus at this point, now that you've made the commitment.

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The little monsters 3

I googled it real quick to see what i could find and i'm afraid to say this seems to be the BYB registry, animals that can't be registered with legit organization end up being registered there. They allow registering of mixed breeds so i guess you really would never know if your pet is purebred or not, but if the breeder chose that particular registry i would assume the latter.