He's always been a placid lump, a lap cat, will slump next to you on the sofa for a nice tummy rub. I've always been his "human" - he sleeps either on top of me or next to me, and has to touch me. In the past two days he has become a hissing bitey nightmare - I can't sit down on the sofa without him attacking me. He has savaged my arm with his claws and teeth and looks a bit mad, with a snarling face, or with his tongue sticking out.
I've no idea what has brought about this change in behaviour. He was yowly when we came back from holiday, I put him on some "calm" cat food, and the yowling stopped and he settled down, back to his usual self. Now he is miaowing to himself and savaging me, but the yowling has stopped. Any idea what has brought on this change in behaviour, please?