hi,
Just back from the vet. The vet thinks he has an infection in his system somewhere most probably related to his mouth. He has periodontal disease. His age is against him for having the teeth removed.
He has had 2 injections and we will start a 5 day course of antibiotics, we also have liquid cat food to feed him til he starts eating again.
The last resort is getting tests done to see if he is suitable for an op to get the teeth removed. Vets not too keen on this option as he is 15years old.
fingers crossed he picks up in the next few days.