Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Some breeds drool a lot naturally, and many dogs drool around food or during car rides. New or excessive drooling can signal nausea, dental problems, something stuck in the mouth, toxins, heatstroke, or bloat. Drooling with retching and a swollen belly, trouble breathing, weakness, or a known toxin exposure is an emergency.
Normal drooling
- Breeds with loose lips (Saint Bernards, Mastiffs, Bloodhounds, Newfoundlands)
- Anticipation of food
- Excitement
Medical causes
- Nausea, including motion sickness
- Dental disease, broken teeth, or mouth sores
- Objects stuck in the mouth or throat
- Toxins, including caustic chemicals, some plants, and certain toads
- Heatstroke
- Esophageal problems
- Bloat (with retching and a swollen belly)
- Neurological problems affecting swallowing
Emergency signs
- Drooling with unproductive retching and a swollen belly
- Trouble breathing or blue gums
- Weakness, collapse, or seizures
- Known toxin exposure
- Signs of heatstroke
What to do
- Check the mouth carefully if safe, but don’t reach into the throat
- If a toad or chemical may be involved, rinse the mouth with a gentle stream of water directed out of the mouth, not down the throat, and call a vet
- For toxins, call ASPCA Animal Poison Control Center (888) 426-4435 or Pet Poison Helpline (855) 764-7661 (fees apply)
Sources
- Merck Veterinary Manual: Ptyalism (excessive salivation)
- Merck Veterinary Manual: Toad poisoning
- Merck Veterinary Manual: Gastric dilation and volvulus in small animals
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.