MONITOR — Can Be Emergency

Cat Drooling: Normal Causes vs Signs of Serious Illness

Cats rarely drool. When they do, it usually means something.

Close-up of a cat being examined by a veterinarian

Quick Answer

Some cats drool lightly when deeply relaxed or purring — this is normal. Sudden or excessive drooling in a cat that doesn't normally drool is almost always a sign of a problem — most commonly dental disease, nausea, oral injury, or toxin exposure. If drooling is accompanied by not eating, difficulty breathing, or lethargy, see a vet promptly.

In This Guide

Normal vs Abnormal Drooling

Normal (No Concern)Abnormal (See a Vet)
Light drool while purring or being pettedSudden onset in a cat that never drools
Drooling during kneading (kittenhood reflex)Drooling with bad breath
Brief drool after smelling strong foodDrooling with pawing at mouth
Very light drool during deep sleepDrooling with not eating or dropping food
Has always drooled a little (personality)Drooling with blood-tinged saliva

Causes Ranked by Frequency

CauseOther SignsUrgency
Dental disease / tooth painBad breath, difficulty eating, pawing at mouthVet within 1-2 days
NauseaLip licking, loss of appetite, hidingMonitor 24h, then vet
Oral injury / foreign bodyPawing at mouth, bleeding, unable to close mouthSame-day vet
Toxic plant or substanceVomiting, lethargy, dilated pupilsEmergency
HeatstrokePanting, red gums, staggering, collapseEmergency
Anxiety / fearCar rides, vet visits, new environmentsResolves with calm
Medication reactionStarted after new medicationCall vet
Upper respiratory infectionSneezing, runny nose, congestionVet within 2-3 days

Dental Disease — The #1 Cause of Cat Drooling

Over 70% of cats have dental disease by age 3. It's the most underdiagnosed condition in cats because cats hide pain extremely well.

Common Dental Conditions That Cause Drooling

  • • Gingivitis — red, inflamed gums, often the first sign of dental disease
  • • Tooth resorption — painful erosion of teeth, affects 30-70% of cats (see cat tooth pain guide)
  • • Stomatitis — severe inflammation of the entire mouth, extremely painful
  • • Broken teeth — from trauma or chewing on hard objects
  • • Oral tumors — more common in older cats

Regular dental check-ups and professional cleanings prevent most dental disease. Professional groomers often notice dental warning signs like bad breath during routine grooming sessions.

Toxic Plants & Poisoning

If You Suspect Poisoning

Call ASPCA Poison Control: (888) 426-4435 or your emergency vet immediately. Do not induce vomiting unless instructed by a professional.

Plants That Cause Immediate Drooling

  • • Lilies — all parts extremely toxic, cause kidney failure
  • • Dieffenbachia — calcium oxalate crystals cause intense mouth pain
  • • Philodendron — same crystal mechanism as dieffenbachia
  • • Pothos — mouth irritation and drooling on contact
  • • Peace lily — not a true lily but still causes oral irritation
  • • Sago palm — extremely toxic, can cause liver failure

When Drooling Is an Emergency

Go to an emergency vet immediately if drooling is accompanied by:

  • • Difficulty breathing or open-mouth breathing
  • • Swollen tongue, face, or throat
  • • Seizures or tremors
  • • Collapse or inability to stand
  • • Known or suspected toxin/plant ingestion
  • • Bleeding from the mouth
  • • Inability to close the mouth (jaw dislocation)
  • • Pale, blue, or white gums (see pale gums guide)

Frequently Asked Questions

Why is my cat drooling all of a sudden?
Sudden drooling in cats most commonly indicates dental disease or tooth pain, nausea, oral injury, or exposure to a bitter or toxic substance. If your cat is suddenly drooling and also not eating, pawing at their mouth, or showing other symptoms like lethargy, see a vet within 24 hours. If drooling is accompanied by difficulty breathing, seizures, or collapse, it is an emergency.
Is it normal for cats to drool while purring?
Yes, some cats drool when they are deeply relaxed, purring, or being petted. This is called happy drooling or contentment drooling and is completely normal. It is thought to be a leftover behavior from kittenhood when kneading stimulated milk flow. If your cat has always drooled a little while purring, there is no cause for concern.
Can dental disease cause drooling in cats?
Dental disease is the number one cause of abnormal drooling in cats. Over 70% of cats have some degree of dental disease by age 3. Gingivitis, tooth resorption, broken teeth, and stomatitis all cause pain that triggers excessive salivation. Signs include drooling, bad breath, difficulty eating, pawing at the mouth, and dropping food.
What plants are toxic to cats and cause drooling?
Many common houseplants cause immediate drooling in cats. Lilies are extremely toxic and can cause kidney failure. Dieffenbachia, philodendron, pothos, and peace lilies contain calcium oxalate crystals that cause intense mouth pain and drooling on contact. If your cat is drooling after chewing a plant, identify the plant and call ASPCA Poison Control at (888) 426-4435.
When is cat drooling an emergency?
Cat drooling is an emergency when accompanied by difficulty breathing, swollen tongue or throat, seizures, collapse, suspected poisoning, inability to swallow, pawing at the mouth with visible distress, or if it starts suddenly in a cat that has never drooled before and is accompanied by lethargy, hiding, or other behavioral changes.

Related Health Guides

Cat Tooth Pain

Signs of dental pain and when to see a vet

Cat Not Eating

Causes and urgency levels for appetite loss

Cat Vomiting

Types, colors, and when vomiting is an emergency

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