A question every day, what’s going on with the puppy foaming at the mouth, not eating, and having no energy?

 7:56am, 17 October 2025

In the process of raising a dog, what the dog owner is most afraid of is that the dog will get sick. If we can detect it in advance and treat it in time, many problems can be avoided. Today, the editor will tell you what happens when a puppy is frothing, not eating, and lacks energy.

1. Infectious diseases

If the puppy has not been fully vaccinated against disease and appears to be frothing and not eating, it is likely to be infected with infectious diseases, such as parvovirus and canine distemper. In severe cases in the later stage, the puppy will have severe diarrhea or even blood in the stool. If you suspect this is the case, it is recommended that the owner take the puppy to the pet hospital in time to detect infectious diseases. If it is confirmed that it is a viral infection, anti-viral treatment, anti-vomiting and anti-inflammatory treatment will be required.

If you do not go to the pet hospital in time, the puppy will usually die because the puppy's immune system has not yet fully developed and its resistance to pathogens is very low.

2. Poisoning

After a puppy is poisoned, it will show symptoms such as listlessness, foaming at the mouth, vomiting, diarrhea, convulsions, etc., such as food poisoning, drug poisoning, pesticide poisoning, etc. Because there is no specific medicine for most poisonings, the owner should immediately induce vomiting or relieve diarrhea after discovering that the puppy has been poisoned, so that the puppy can expel the swallowed toxic substances from the body. If it has been absorbed by the body, it needs to be treated at a pet hospital as soon as possible.

3. Gastroenteritis

If the puppy's vomit is white, transparent mucus, it is likely to be the dog's gastric juice. This is usually a damage to the puppy's gastrointestinal tract, causing more serious gastroenteritis. Symptoms such as vomiting and foaming, loss of appetite, listlessness, and loose stools will generally occur. At this time, the owner can first feed the puppy some probiotics to see if there is any relief. If the situation is more serious, the puppy needs to be taken to the pet hospital for treatment in time.