If no other signs or symptoms of a problem, just ignore it. Mine will occaisionally not eat for a day and a half or so, then tuck in like there is no tomorrow. Try not to intice with special treats or goodies, unless you intend to keep on doing so, it can bring on picky eating. Mine always get a little something extra in their food at suppertime, such as a can split three ways, cottage cheese, chicken broth, or table scraps. But that is every night, before they decide to eat or not. I'm sure there are folks that would not agree, but it works for us.
Stella