Please get him to the vet ASAP ... I can't help you with why, could be many different reasons. But not eating since Satrday and not now wanting water is really a not good thing ...

Yes, get him to a vet immediately. Not eating for more than 24 hrs puts him at risk of developing potentially fatal hepatic lipidosis. The vet will do a manual exam where he can see if he can feel any obvious oddities or trouble spots. Bloodwork can also provide considerable diagnostic information. If the vet thinks there's a possibility of intestinal obstruction, he may recommend an abdominal x-ray, as well.

Laurie

Yes get to vet asap for above mentioned reasons and get a diagnosis. One thing they would probably do is a quick check for diabetes (something overweight cats on high carb diets are prone to - however that usually involves increased thirst not a decrease, so who knows). Good luck - sorry to hear your boy is sick.

Thanks everyone. I already know that I have to take him to the vet( which I did last night) and I know that there can be hundreds of reasons. I posted this to discus some of those reasons.and hear experiences. That s why forums are for, right? :) However, I really appreciate your concerns. The wet did a glucose test, but it was ok. He said Tommy was dehydrated, so they gave him some fluid, and when the doc gave him some treats he immediately started eating. I couln t believe , at home he wouldn t eat anything. The wet said it could be psychological too. That he got scared of something very bad and stopped eating.He gave him pills to stimulate apetite and said to come back if it doesn t help. At home he went straight to the food bowl and took two small bites, he drank water too, and this morning he.didn t eat again before I left for work.

You need to get bloodwork to get his levels. Problems may show in bloodwork or X-ray.