What should I do if my puppy is vomiting white mucus?

Possible causes:

Sudden change in dog food: Vomiting white mucus is a normal phenomenon if it's caused by a sudden change in dog food. No special treatment is needed. If the puppy has other adverse reactions, such as loss of appetite, diarrhea, and nasal congestion, it's abnormal and建议 taking the puppy to the vet.
Functional indigestion: This is a disease caused by disorders of the stomach and duodenum. Symptoms usually include post-meal bloating, upper abdominal pain, nausea, and loss of appetite. In severe cases, there may be excessive stomach acid secretion, causing vomiting with white mucus. Treatment involves following the doctor's advice and taking digestive medication.
Parasite infection: It usually occurs after eating food contaminated with bacteria, leading to parasites in the intestines, affecting normal eating, and even stimulating the gastric mucosa, resulting in vomiting white mucus. Treatment involves taking parasite-expelling medication under a doctor's guidance.
Cold: Usually caused by multiple virus infections, such as influenza viruses, adenoviruses, and rhinoviruses. Typical symptoms include sneezing, nasal congestion, and runny nose. As the disease progresses, it may cause severe stimulation of the respiratory tract, producing excessive mucus, which is white in color. Treatment involves taking antiviral medication as prescribed.
Canine Parvovirus: This is a disease that occurs in canine animals, caused by infection with the canine parvovirus. It causes vomiting of mucus, which is white or yellow, and is accompanied by weight loss and diarrhea. Treatment involves taking antiviral medication as prescribed.
Canine Distemper: If a puppy has canine distemper, it may exhibit symptoms such as fever, loss of appetite, and fatigue. If not treated in time, it may lead to vomiting of white foamy mucus. Treatment involves following the doctor's advice and receiving intravenous antiviral medication.

If your puppy is vomiting white mucus, it's essential to observe its overall condition and consult a veterinarian for a proper diagnosis and treatment.