Puppy Vomiting White Foam In Morning. If so, it could be due to acid building up overnight in his stomach. Foamy vomit may occur if a pooch has excess gas in his stomach. The stomach will become swollen and hard. If so, it could be due to acid building up overnight in his stomach. The most common reason for a dog to throw up white foam is gi distress. Your pet may spit up white foam after eating or exercise because his stomach has filled with air or fluid.
Is your dog throwing up white foam specifically in the morning?
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