If Fido ate grass, dirt or something else he shouldn't have, white foam can be a sign of his digestive system reacting and trying to get the bad stuff out. Simple indigestion should be resolved on its own, but keep a watchful eye on him just to be safe.
Is your dog throwing up white foam specifically in the morning? If so, it could be due to acid building up overnight in his stomach. A diet of plain chicken and boiled rice for a few days may help calm his stomach and decrease acid reflux. If it occurs frequently, your dog should see a veterinarian.
This upper respiratory disease may lead to a dog throwing up white foam in addition to nasal discharge, excessive coughing and eye drainage. Although it usually runs its course in 14 days, it is always best to seek medical attention.
When an abnormal buildup of air and intestinal fluids occurs, it can lead to your dog's stomach bloating up. This can be fatal, since it constricts veins and blood flow. Usually other symptoms accompany the white foam, including inability to defecate, increased drooling, coughing or pale gums. If your dog exhibits any of these symptoms in conjunction with white foam, seek medical attention immediately.
A serious cause of white foam can be kidney disease. Dogs that have been urinating more than usual or having accidents in the house may start to vomit and exhibit more serious symptoms as the kidney disease progresses. You should visit a veterinarian and discuss if dietary changes are needed. A diet with a low level of phosphorus and moderate level of protein, but of high quality, can help manage kidney disease. If treated early, dogs can lead a healthy life with minimal problems.
If your dog is up to date on vaccinations, white foam should not be a sign of rabies. If a dog does manage to get rabies, white foam is usually one of the last symptoms they exhibit (after extreme aggression and muscle spasms).
Regurgitation vs. Vomit
There is a difference between regurgitation and vomit. Regurgitation is when the dog throws up food that has not been digested yet, and the kibbles can be recognized easily. This is usually not serious and it might be due to the fact that the dog has eaten its food too fast. On the other side, vomit is when the food has already been digested, and it can have a greenish/yellowish color (bile salts). Vomit is a more serious issue as it can be a sign of disease.
A dog throwing up white foam is a sign of digestive tract issues, so watch for additional signs to determine how quickly you need to seek medical attention. While many dogs may just throw up white foam because they ate something they should not have, it is better to be safe than sorry. Consult a veterinarian if you are uncertain.
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