Warmest Welcome to the forum, Mary,
Is he going to the bathroom okay? Are his stools any smaller, or do younotice any difference in them at all? Do you ration his food or do yougive him an unlimited supply?
Rabbits tend to go off their feed if they're in pain, or have a hairblockage that they can't pass, have a problem with their teeth, etc.
Just today you said? Perhaps he was a bit under the weather? See whattonight and tomorrow morning brings before you panic too much.
You might offer him some parsley because that can help promote anappetite. If you're in the USA, there's a product primarily made forcats and dogs, but it's good for rabbits too. It's called NutriCal andwill help keep their nutrients up and stimulate an appetite whenthey're not eating, besides, it helps to boost the immune system. (Onlyabout an inch is needed each day or so until they start to get theirroutine back.) It's a good thing to have in the house.
You could try making a rabbit slurpie by putting water in with thepellets until they're soaked up and become mush. He may need to have itsyringe-fed it to him if he goes a day with no feed.
Drinking water is the most important. Dehydration can kill a rabbit, sobe sure that he keeps drinking. Syringe water to him if you notice he'snot drinking.
-Carolyn