Poor Angus! I hop eyou are feelingbetter soon!

Anna, I know it is a greater concern with senior dogs, but Sadie will sometimes not eat much for a day or two when she isn't feeling good. I didn't read others reponses, so maybe someone has already said this, but the yellow stuff is stomach bile and just means his stomach is empty. Dogs know when thier stomachs are quite right and often won't eat. Maybe try a little boiled chicken or hanburger tomorrow. It is easier for the dogs to digest then kibble, and small amounts better on an empty stomach so there is no temptation to overeat and get sick from that.

((HUGS))