My 2 year old long haired cat had got matted and after searching about for a cat groomer (hardly any in my area - had to travel 25 minutes to get to them) he has been and got scalped! I try to brush him but he runs away and then his undercoat is so dense you can't get a comb or brush through it.
Since coming back my other cat has been very suspicious of him and has hissed and run away from him. Do you think he will eventually accept him again as his brother?