The reasons why the puppy suddenly fell to the ground, convulsed and foamed at the mouth:

1. The dog ate expired moldy food or rat poison, which caused a poisoning reaction.

2. The later symptoms of canine distemper will appear neurological symptoms, mainly including twitching, moaning, drooling, etc.

3. It may be because the dog suffers from epilepsy. If this is the case, the dog will return to normal after a while.

Treatment methods for puppies convulsing and foaming at the mouth:

1. You can inject tetanus antibiotics, penicillin injection or sulfadiazine, etc., and drink plenty of water.

2. Clean the secretions from the dog’s oral and nasal cavities promptly to avoid choking or aspiration pneumonia.

3. If a dog suffers from epilepsy, treating epilepsy is a long process. It is recommended that the owner always have anti-epileptic drugs at home.