Ahri, this was proved by my science teacher. I think it had something to do with their teeth.
I'm not sure about that enemy thing though... I don't think foxes/dogs and cats are enemies, it's just a debate who people think that are better.
They're not, foxes are apart of the same biological family as wolves and dogs -- the canidae. I think what you're thinking about is the two branches in the canid family, the caniforms and feliforms. I'd guess foxes fall under the feliform branch sine they're much smaller, but despite the name of "cat-like" they are still related to wolves and dogs.
Comments on Profile Post by Lilyluka