Why Is My Dog Drooling Excessively?
Veterinary references checked with PetHealth+ · Last reviewed June 2026
By the Global Animal Guide editorial team Veterinary references checked with PetHealth+ ( process ) Last reviewed Cite this page How we research & review
Sudden heavy drooling may signal nausea, mouth pain, toxin exposure, or heatstroke. Some breeds drool normally, but a change in amount always deserves attention.
Normal droolers
Mastiffs, Bloodhounds, and Saint Bernards drool more by anatomy.
Concerning causes
Foreign bodies, dental abscesses, bloat, seizures, and plant or chemical toxins.
Action
Note whether drooling started suddenly, smells foul, or pairs with vomiting or pawing at the mouth.
Related: Chocolate poisoning · Bloat in dogs
Frequently asked questions
Can car sickness cause drooling?
Yes — nausea often causes hypersalivation before vomiting.
Is drooling a sign of poisoning?
It can be — especially with toxins, plants, or toads; seek vet advice if suspected.
Do teething puppies drool more?
Yes — increased drooling is common during teething.
When is drooling urgent?
With retching, swollen abdomen, collapse, or known toxin ingestion.