What causes a dog to foam at the mouth?

Seizures can cause a dog to foam at the mouth. ... Rabies can also cause foaming at the mouth and erratic behavior. But, instead of the behaviors lasting a short time, the dog will act erratically and foam at the mouth for a long time. Again the foam is caused by excessive drooling and rapid breathing. read more

As your dog rapidly pants, the oxygen he is taking in can cause the saliva in the mouth to foam up. The mouth foam usually will go away as your dog’s system begins to settle down. As your dog drinks water or lies down, the respiration will return to normal and the foam will disappear. read more

Seizures can cause a dog to foam at the mouth. The seizure activity often causes a dog to salivate and rapidly pant, creating foam around the mouth. Depending upon the severity of the seizure activity, wild or erratic behavior may accompany the foaming at the mouth. read more

Foam coming from a dog's mouth might be caused by exercise, anxiety, nausea, ingestion of a bad-tasting substance, a dental disease, liver or kidney disease, difficulty swallowing, poisoning, a seizure, a side effect of medication or rabies. read more