I got a kitty from the shelter about 6 weeks ago and he is usually very sweet. Loves to be held, petted, follows me every where.He thinks I'm his mother. But, then there are times he gets frisky and plays hard. He will grab my arm with his claws and then bite me. Like he caught something and is fighting it. I have to keep taking him off my arm and putting him on the floor. He finally stops after 3 or 4 times. I firmly tell him NO !