Yellow vomitus is colored this way due to bile refluxing from the proximal duodenum back through the pylorus and into the stomach. It can be a sign of stomach or upper intestinal problems and the animal should be evaluated by a veterinarian.
It's bile, a chemical secreted by the liver for digestion. If a dog vomits yellow stuff or foamy yellow stuff it generally means his stomach is empty and this is causing nausea. Try increasing the...
Probably wrong: Yellow vomit is bile(stomach acid). It can vary from almost white too very dark(or bright) and is usually foamy. However, I have wondered about urine. My dog has recently been eating...
The culprit could possibly be a stomach virus or something he may have eaten. If your dog continues to vomit without any reason go for a check up at your local veterinarian.