Hi, my 16 year old cat has always kept himself impeccably groomed. He would never let me brush him, but fortunately he took beautiful care of his coat himself. (I've been clipping his claws every two weeks for 15 years and he always acts like I'm trying to kill him!) Over the summer, I noticed the fur over his haunches has gotten terribly matted - is that an age thing? Maybe he's not as dexterous? Anyway, should I take him to a groomer or the vet for this? I'm thinking vet, since he's due for a checkup anyway. He won't let me do anything. Thank you!