What Does It Mean When My Dog Vomits Yellow Liquid?

Regular vomiting in dogs is not normal.  The yellow liquid he is vomiting is called bile--it is stomach acid and digestive liquid.  Whether this is a long term (chronic) or sudden onset (acute) problem this dog needs to be examined by a veterinarian. 
Acute vomiting is often caused by dietary indiscretion, foreign body obstruction, viral gastritis, pancreatitis, or idiopathic (unknown) gastritis. 
Chronic vomiting can by caused by chronic gastric (stomach) foreign body, kidney disease, liver disease, neoplasia (cancer), inflammatory bowel disease, and intestinal parasitic diseases.
Depending upon the presentation--your dog's age, prior conditions, length of symptoms, and severity of symptoms--initial diagnostics may include bloodwork, fecal exam, and x-rays.

My dog just did this this morning, which is why I'm here. Everything that I've read so far, just indicates that the dog threw up on an empty stomach. (I was literally, just about to feed my dog breakfast when she did it, so she probably was empty). If it persists, call the vet. As the other person said, if it's just a one-time deal, you can usually get away with just keeping an eye on them at home.

The coloring is normal. Stomach bile is yellow and is always being made so when there is nothing to vomit up you will notice the yellow of the stomach acid. The fact that your dog is vomiting is concerning. If it is a one time thing you can probably watch her at home but if she has vomited several times you need to bring her to the vet.

It's stomach acid see a vet

And  has yellow diarrhea and just lies around.

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I have a yorkie that is almost 15 years old, he has been staggering around like he is drunk, what could be wrong with him?

Take your dog to a vet my dog was found to have kidney failure he was vomiting yellow matter best to be safe

My dog vomited twice in the back garden I got a bit worried so I opened the windows and I put the paper down and put fresh warter in the room what should I do to get him beter ?