My 6 year old male cat seems to shed a lot. We try brushing him but he still sheds, he also seems to pull out big clumps of fur with his mouth. He has no bald spots, no fleas or anything, a few times a week I will come home to a couple of big clumps of his black hair all in one spot on the carpet, usually where he was just laying, I have also seen him pulling it out. Is it a sign of any medical problems? He has a very good non stressed life and gets a lot of attention. Anyone have any info?? Thanks.