Our, very large, 7 year old cat has started coming home with bites and scratches. He's obviously getting into scraps and I had to take him to the vet last week to get antibiotics for a particularly bad one on his neck.
He's neutered and this hasn't been a problem except recently, the bites are usually on his head and front - so the vet says he's giving as good as he's getting, rather than running away.
But..is there anything I can do other than lock him in - which I'm reluctant to do. He's always had access to outside (safe back lane etc) and a microchip cat flap.