[Vinniedoggy]

My little guy, Vinnie, has vomited bile for morning in the years. The trick to preventing it is giving him a "snack" right before we go to bed. If I do that, and get him fed the next morning at a reasonably early time, there is no vomiting of bile. If he doesn't get a snack before bed, he will frequently start vomiting in the middle of the night and into the next morning, and then refuse breakfast.

I have seen him occasionally vomit a bit of blood in the bile, but only rarely (maybe a few times a year). The vet attributed it to his stomach being irritated. When he does this, he also sometimes ends up with diarrhea and blood in that. The general rule is that if the blood is small in quantity and bright red, you don't have too much to worry about (assuming it is transient). If it is dark or has the appearance of coffee grounds, you should get to the emergency vet immediately.