Brian,

If your kitty has not been to the vet or is not receiving veterinary care,
that would be the first place to start.

Assuming that he has been to the vet, a couple of ideas -

First, it is very important that a cat has enough water and food or the cat
may become so weak that he
cannot eat.  An application of subcutaneous fluids can really help a cat
feel better.  I had a severely ill
cat several years ago and learned to do it at home (not hard at all,
although it worked best when the fluid
was heated up to just body temperature).  The vet can do it and it might
just be what he needs to start
feeling better.

Feeding liquid broth with a syringe helped my cat.  (a vet or a feed store
should have a feeding/medication syringe (without
a needle)).  I mashed up a bit of canned cat food and tuna and added the
water from water packed tuna and it helped her.

Even an eyedropper can provide a little liquid, but it would take great
patience to provide enough liquid with an eyedropper.

What is the problem that he is not eating?

Good luck!

Allan

What advice has your vet given you so far?

Thanks for your advice everyone.
The cat is now starting to eat again.

Regards Brian