I have a Russian Blue cat I named Czar. He loves sitting on my shoulder and follows me around the house like a puppy. The only problem is every once in awhile he will run and bite my leg/ankle really hard. I have been on antibiotics a couple of times because of this. It shocks everyone as he only attacks me and yet is totally affectionate with me. Why does he do this? It can happen at any time and I am getting so I don't trust him and am uncomfortable if I don't know exactly where he is. I don't want to get rid of him, but I am running out of ideas as to what to do. Help!