My brown tabby cat Louie is about 8-9 pounds. I have not weighed him in a little while but he definitly has a belly that hangs down. He is about 7 months and I feel that he is getting overweight. I am feeding him Purina One Kitten. I was not measuring his food but started giving him a half of a cup in the morning and a half a cup at night. Is this enough and normal?