One of my rescue pusses (now about 10 yrs old) has never tolerated being groomed, despite many, many gentle attempts. The vet told us not to persevere as he got so distressed and vicious (he doesn't like being stroked anywhere other than his head, he's not a very friendly cat). All was fine for most of the 8+ years we have had him, he's shed a bit but no major problems as his coat is quite short anyway and he goes outside. He's never been the best at grooming himself though, it's a bit cursory.
In the last few weeks he's developed some big matted clumps on his back and I can't see them coming out even if he would allow us to brush him. I don't think there's anything else wrong, he's eating fine, weight ok etc. but I guess as he gets older he might be getting a bit stiff. I dont know what to do with them, I imagine they are pulling and a bit uncomfortable, and they're not going to go on their own.
He goes to the vets for annual jabs in a couple of weeks, so I can ask then and see if vet recommends clipping. But in the meantime, has anyone else dealt with this?