Dog won't eat, yellow diarrhea, and winning a lot About two days ago, I changed my dogs food to what I believe to better for her(Gravy Train to Purina). Since then she refuses to eat it, unless I mix a can food with it, and today she is not touching it at all. She will eat treats and any human food.

Update: she isn't eating the caned food mix anymore.

Today I made some white rice with chicken stock, she refuses to touch it.

Since yesterday she has had yellow diarrhea. With the last bowel movement, it has darken up a little. She is also very whinny and will play for a short time.

When I take her for walks or outside she seems her normal self

She is a year old Pitt lab mix

she was bitten/ stung by a bug a few days ago. I seen her flinch when it happened, but couldn't see what stung/ bit her. She has had a lump on her muzzle ever since.