Puppy Vomit White Phlegm. Is your dog vomiting white foam in the morning before eating? The white foam is a mix of saliva and . Kennel cough and other upper respiratory problems may cause dogs to cough up foamy white liquid. The foamy appearance may be caused by the vomit coming into . If your dog solely vomits foam or a yellow or clear . Is your dog vomiting white foam in the morning before eating?
If your dog vomits white foam just one time, there is no need for immediate concern.
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