Thank you all for your answers. I'm still trying to figure it out. He wasn't doing this when we moved, and we are going on our second year in this place. He gets all the attention he wants. You see how gorgeous he is, but now, he has huge patches in his fur, and his lower back and tail is almost all pulled out. Plus, he scratches around his neck to the point of big red spots and scabs. I haven't noticed a mite problem. A previous cat had those in his ears, and there is no sign of it in these guys. I can't think of a reason for him to be stressed so my only thought is either the fleas are bothering him too much (may skin sensitivity) or an allergy, and if it is allergy, it may be the food. I will have to take him to get checked if I can't figure out what he needs. Thanks.