What color of dog vomit should be paid attention to?

Dog owners know that occasional vomiting isn’t always a red flag—maybe they ate too fast or snuck a questionable table scrap. But certain colors in your pup’s vomit can signal serious issues, and knowing the difference could save a trip to the vet or even their life.​

Bright red vomit, looking like fresh blood, is never normal. It might mean a cut in the esophagus from retching or something more severe, like internal bleeding. In places like California, where strict animal welfare laws require prompt veterinary care for injuries, delaying treatment here could land you in trouble legally, not just risk your dog’s health.​

Dark brown or black vomit, sometimes described as looking like coffee grounds, is another warning sign. This color often indicates partially digested blood, which could come from issues like ulcers or blockages in the stomach or intestines. If you notice this, especially alongside lethargy or loss of appetite, don’t wait—many European countries have regulations mandating that pet owners seek professional help for prolonged symptoms to prevent unnecessary suffering.​

Yellow or greenish vomit is common on an empty stomach, as it’s usually bile from the liver. While occasional bouts might just mean your dog needs a smaller, more frequent meal schedule, persistent yellow vomit could point to pancreatitis or other digestive disorders. In the UK, for example, neglecting such symptoms could be considered a breach of the Animal Welfare Act, which requires owners to provide appropriate care.​

White, foamy vomit often happens when a dog has an empty stomach and is vomiting up mucus or air. It’s generally less concerning than other colors, but if it happens frequently—say, every morning for a week—it might be a sign of acid reflux. Adjusting feeding times or switching to a specialized diet could help, but it’s still worth mentioning to your vet during your next visit to rule out underlying issues.​

Clear vomit, which looks like water, might seem harmless, but if it’s accompanied by excessive drooling or difficulty keeping water down, it could indicate heatstroke or dehydration—especially important to watch for in warmer climates like Florida or Spain. Never ignore these signs, as dehydration can quickly become life-threatening for dogs.​

No matter the color, if vomiting is accompanied by other symptoms like diarrhea, fever, seizures, or inability to keep any food down, it’s time to act fast. Remember, as a pet owner, you’re legally and morally responsible for your dog’s well-being. Knowing what to look for in their vomit is a key part of keeping them healthy and happy.