Quote:
Originally Posted by Minka 
I'm going to third that no matter what, don't let your cat go a whole day without food. 12 hours is the max amount of time.
Try putting out wet and dry at the same time or mixing the two together. Then reduce the amount of dry food you give until he is on a wet only diet. Also change the amount of dry food to 1/4th or 1/3rd cup per day.
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Do not do that - obese cats can quickly go into hepatic lipidosis by consuming 1/2 of the calories/nutrition amount - as quick as in a week or so.
You need to be very very careful when dealing with an obese cat. I have been through a lot of vets with my own overweight cat Bugsy, and all of them told me rule of thumb: 24 hours. Never more than 24 hours without food - for any reason. Bugsy has been close to 24 hours without food quite a few times due to dentals, procedures, etc, but when it got that close, no matter what, I was force-feeding him per my vet's instructions... And that's the rule for any of my cats.
If your cat is eating 1/2 cup a day of dry food, for an 18lb, that is not a lot. Sure if your kitty is fat, you can cut a bit. But a little bit at a time, give him time to adjust, then cut more. Never cut his intake by half - you can end up putting the life of your cat in danger.
Wet food would be absolutely great, trying to change his food to a less caloric food would be another option - IMHO, stay away from "light" foods, they are filled with carbs and fillers that do no good. On the other hand, if you go to a protein rich, grain free, watch out the calories - I went that route and Bugsy gained weight (he is 17.9lbs now, but has been 20 - he is also a large breed, Ragdoll). There are more and less caloric foods, and I don't care what people/theory say, calories still DO play a role when you are talking about a lazy and obese cat.
IMHO, your best bet is to get him moving...If you spend some time with him and put some effort into it, he will move - you have to play with him though.... Some cats do on their own, some need us to do it with them.
