I have a kitten, named Havoc, he's almost a year old. He's an outdoor/indoor cat, but this last time that I let him out, he came back with a sore paw. He limps on it, hates it being touched, screams out when I pick him up, I've searched his paw the best I could, and I am not finding any other animal scratches or bites, so i ask, could it be Sprained? Should I take him to the vet? or will it heal on its own? Any advice would be useful thanks.