A dog throwing up foam is often due to a few common causes including an empty stomach with stomach acid irritation, dietary indiscretion, gastrointestinal inflammation, or respiratory issues like kennel cough. Vomiting white foam usually indicates the stomach is empty or upset, with foam being a mixture of stomach acid and saliva. Other possible causes include pancreatitis, ingestion of toxins, bloat (gastric dilatation-volvulus), internal blockage, or infections. Persistent vomiting, especially if accompanied by other symptoms like lethargy, abdominal pain, diarrhea, or behavioral changes, requires prompt veterinary evaluation to rule out serious conditions. Occasional vomiting of foam can sometimes be managed by feeding smaller, more frequent meals or addressing the diet but always best to consult a vet for accurate diagnosis and treatment. In summary, throwing up foam in dogs might be caused by:

• Empty stomach acid irritation or bilious vomiting syndrome
• Eating something unusual or toxic
• Gastritis or gastrointestinal inflammation
• Pancreatitis or other organ issues
• Serious conditions like bloat or blockage
• Respiratory irritation such as kennel cough

If vomiting is frequent, severe or accompanied by other worrying signs, vet care is necessary.