Why is my dog drooling excessively?

Excessive drooling can be normal for some breeds but may signal dental disease, nausea, heatstroke, toxins, or oral injury. Learn when to act and when to seek emergency care.

Why is my dog drooling excessively?

A small amount of drooling is normal for many dogs — but sudden or excessive saliva can be a sign of discomfort or a medical emergency. This guide explains common causes (ranked by likelihood), how to tell normal breed drooling from concerning drooling, associated signs to watch for, safe home steps you can take, and clear guidance on when to see a vet immediately.

Normal drooling breeds vs concerning drooling

Breed-related (normal) drooling

Some breeds naturally produce more saliva or have facial conformation that allows drool to pool and drip. Dogs commonly described as "slobber breeds" include:

• Saint Bernard
• Mastiff and bullmastiff
• Bloodhound
• Newfoundland
• Boxer
• Neapolitan Mastiff

Concerning drooling

Seek assessment if drooling is new, markedly increased, or accompanied by other signs: reluctance to eat or drink, pawing at the mouth, bad breath, bleeding or swelling in the mouth, vomiting, weakness, staggering, facial swelling, breathing difficulty, or behavioral changes. New-onset drooling is more likely to reflect an underlying problem than long-standing breed-related slobber.

Differential diagnosis overview (common causes ranked by likelihood)

Below are common causes of excessive drooling, ranked roughly from most to least likely in general practice. Each includes a short description and typical associated signs.

• Periodontal disease, infected teeth or oral ulcers cause pain and increased saliva. Dogs may drop food, paw at the mouth, have bad breath, or bleed from gums.

• Gastrointestinal upset from motion sickness, dietary indiscretion, systemic illness, or organ disease often causes hypersalivation. Look for vomiting, reduced appetite, lethargy.

• Sticks, bones, foxtails, or other objects can puncture or lodge in the mouth and tongue, causing sudden drooling, pawing at the face, bleeding or reluctance to eat.

• Many household and outdoor substances (chocolate, xylitol, pesticides, heavy metals, caustics) cause drooling. Toxin exposure often causes vomiting, tremors, collapse, or seizures.

• Overheating causes heavy salivation along with panting, weakness, collapse, reddened gums, and rapid breathing.

• Slow-growing masses can cause gradual drooling, bad breath, bleeding or difficulty chewing.

• Conditions that affect facial nerves or swallowing (e.g., brain disease, nerve injuries) can cause drooling and difficulty swallowing.

• Uremia (kidney failure), liver disease, and rabies (rare in vaccinated populations) can lead to hypersalivation.

• Anticipation of food or excitement can increase saliva in some dogs; this is usually predictable and not accompanied by other signs.

Sudden onset vs gradual onset drooling

• Sudden onset drooling often points to acute problems: foreign body stuck in the mouth, chemical or toxin exposure, sudden dental trauma, or heatstroke. These situations can progress rapidly and may be emergencies.

• Gradual onset drooling develops over days to weeks and frequently suggests dental disease, an oral mass, chronic nausea, or systemic illness such as renal or liver dysfunction.

Associated symptoms to watch for

Drooling rarely occurs alone. Note any of the following and share them with your veterinarian:

• Pawing at the mouth, reluctance to open mouth
• Bad breath (halitosis)
• Bleeding from mouth or around teeth
• Swelling of face or under jaw
• Difficulty eating, dropping food, excessive drooling while trying to eat
• Vomiting or diarrhea
• Weakness, collapse, trembling, seizures
• Fever or signs of pain
• Rapid breathing, cyanosis (blue gums) or respiratory distress
• Sudden changes in behavior or coordination

When to See a Vet Immediately

If you see any of the following, this is an emergency — call your regular vet or an emergency veterinary hospital now. Do not wait:

• Severe or sudden drooling with collapse, seizures, or extreme weakness
• Drooling with difficulty breathing, noisy breathing, blue/pale gums, or inability to breathe normally
• Large facial swelling, especially around the muzzle or throat (possible allergic reaction / airway compromise)
• Evidence of having chewed or licked a strong toxin (caustic chemical, pesticide), or signs of poisoning: vomiting, tremors, drooling, collapse
• A sharp foreign object visibly lodged in the mouth that is causing bleeding or airway obstruction
• High body temperature, heavy panting, drooling and collapse (suspected heatstroke)

Red Flags - Seek Emergency Care

• Sudden inability to breathe or swallowing difficulty
• Seizures or loss of consciousness
• Rapid onset facial/throat swelling
• Continuous bleeding from the mouth
• Signs of severe toxin exposure (drooling with tremors, vomiting, collapse)

Home care — safe steps you can take right away

You can take some immediate, supportive steps while arranging veterinary care, but avoid home treatments for serious causes:

• Remove your dog from the source of danger (take away chewable objects, move away from spilled chemicals, place in a cool, quiet area).
• If overheating, move to shade, offer cool (not ice-cold) water, and apply cool, wet towels to the body while heading to the vet — do not aggressively ice down as extreme cold can cause shock.
• If you see a foreign object you can easily and safely remove with gloved hands (very superficial and not embedded), you may remove it. Do NOT attempt to pull out deeply embedded objects or ones that may be large or sharp — leave this to the vet.
• Do NOT induce vomiting or give home antidotes unless specifically instructed by your veterinarian or a poison control specialist.
• Collect information for your vet: what your dog may have eaten, any chemicals they were exposed to, the time signs began, and a sample of vomit or the suspected substance.
• Keep your dog calm and transport them safely to the clinic.

How veterinarians diagnose and treat excessive drooling

At the clinic your vet will take a history and do a full physical exam including an oral exam (often under sedation if painful). Diagnostics may include:

• Oral and dental exam with dental radiographs
• Bloodwork (CBC, chemistry) to assess systemic illness
• X-rays or ultrasound if a swallowed object, mass, or thoracic concern is suspected
• Endoscopy or oral surgery to remove foreign bodies or take biopsies of masses
• Toxin testing and targeted treatments (activated charcoal, IV fluids, specific antidotes when available)
• Supportive care: pain control, antibiotics for infection, IV fluids for dehydration, oxygen therapy if needed

Prevention and follow-up

• Maintain regular dental care: home toothbrushing, dental chews as recommended, and professional dental cleanings when advised.
• Supervise outdoor play to prevent foxtail and stick injuries; avoid leaving small objects where dogs can swallow them.
• Lock away household toxins and human foods that are dangerous to dogs (xylitol, certain medications, pesticides).
• Monitor high-risk situations for heatstroke (hot weather, confined cars) and avoid strenuous activity in heat.
• Schedule rechecks if your vet treats dental disease, removes a foreign body, or suspects a mass.

Key Takeaways

• Some breeds normally drool a lot; new or sudden excessive drooling is more concerning.
• Most common causes include dental disease, nausea, oral foreign bodies, toxins and heatstroke.
• Sudden onset drooling, breathing difficulty, seizures, collapse, facial swelling or signs of toxin exposure are emergencies — seek immediate veterinary care.
• Do not attempt major procedures or induce vomiting at home; remove obvious hazards, keep your dog calm, and contact your vet or poison control.

Resources

• Merck Veterinary Manual — Salivation & Oral Disease: https://www.merckvetmanual.com/
• ASPCA Animal Poison Control Center: https://www.aspca.org/pet-care/animal-poison-control (phone: 888-426-4435; fees may apply)
• Pet Poison Helpline: https://www.petpoisonhelpline.com (phone: 855-764-7661; fees may apply)

Frequently Asked Questions