Some cats drool lightly when kneading or relaxed — this is behavioural and distinct from sudden heavy hypersalivation with distress, hiding, or vomiting.

Can dental disease cause drooling in cats?

Yes — painful teeth, gum disease, and oral ulcers cause drooling, pawing at the mouth, and reluctance to eat. See your vet for a mouth examination.

Is drooling an emergency in cats?

Sudden heavy drooling with known toxin exposure, difficulty breathing, collapse, or extreme lethargy is an emergency. Phone your vet or emergency clinic immediately.

Why does my cat drool in the car?

Motion sickness is common. Some cats also hyperventilate from stress. Ask your vet about safe anti-nausea options before long journeys.

Cat Health

Why Is My Cat Drooling Excessively? UK Causes & When to Worry

Published 25 June 2026Last updated 25 June 20264 min read

Quick answer

Light drooling when kneading is often normal. Sudden heavy drooling — especially with pawing at the mouth, hiding, or vomiting — may mean nausea, dental pain, or toxin exposure. Lilies, permethrin in dog flea products, and human medicines are common UK cat toxins. Known toxin contact is an emergency.

Normal drooling vs hypersalivation

Some cats drool a little when content — kneading a blanket or purring on your lap. This is usually a thin strand of saliva, not soaking fur or pooling on the floor.

Sudden hypersalivation — thick strings of drool, wet chin and chest, often with distress — needs investigation.

Usually harmless:

Light drooling during kneading or purring
Brief drool before vomiting a single hairball — see Cat hairballs

Needs investigation:

Sudden heavy drooling without obvious cause
Pawing at the mouth or refusing to eat
Drooling with vomiting, hiding, or not eating
Foul breath or visible oral swelling
Drooling after plant, chemical, or medication contact

Common causes in UK cats

Cause	Typical signs	Notes
Nausea	Drooling before vomiting, lip smacking	Motion sickness, kidney disease
Dental disease	Bad breath, pawing mouth, reluctance to eat	See Cat dental care UK
Oral ulcers or foreign body	Sudden drooling, difficulty eating	String or bone fragments — urgent check
Lily poisoning	Drooling, vomiting, lethargy	Emergency — see Lily poisoning
Permethrin toxicity	Tremors, drooling, seizures	From dog flea products on cats
Human medications	Sudden illness after access to tablets	Never medicate without vet advice
Heat or stress	Panting and drooling	See Cat hot weather safety

Toxin exposure

Cats are sensitive to many substances that seem harmless. Lilies — all parts are toxic. Permethrin in some dog flea treatments causes severe reactions in cats. Essential oils, cleaning products, and human painkillers are also dangerous. If exposure is possible, phone your vet immediately.

When to see a vet urgently

Phone your vet immediately or use emergency out-of-hours care if:

Known or suspected lily, permethrin, or medication ingestion
Difficulty breathing, open-mouth breathing, or collapse
Seizures or tremors with drooling
Extreme lethargy or unable to stand
Severe vomiting with blood or repeated retching
Drooling after string, ribbon, or bone ingestion

Book a same-day appointment for sudden heavy drooling without obvious toxin access — mouth pain and nausea need prompt assessment.

Home care before your appointment

While waiting for a vet visit, note:

When drooling started and how much
Possible toxins — plants, cleaning products, medications, flea treatments
Appetite and vomiting — see Why is my cat vomiting?
Behaviour — hiding, vocalising, or aggression when mouth touched

What you can do at home:

Keep your cat calm and confined safely if disoriented
Do not force food or water if vomiting
Bring the product label or plant if toxin exposure is suspected
Gently wipe drool with a damp cloth — do not inspect the mouth if your cat is painful

What not to do:

Do not give human anti-nausea or pain medicines
Do not induce vomiting unless your vet instructs you
Do not delay if lily or permethrin exposure is possible

What your vet may do

Examination may include checking the mouth, teeth, tongue, and throat under sedation if needed. Your vet might recommend:

Blood tests for kidney disease or metabolic illness
Dental treatment or extraction for painful teeth
Toxin-specific care — activated charcoal, fluids, or hospitalisation
Anti-nausea medication for motion sickness or illness

Treatment depends on cause — dental disease needs oral care; toxins need urgent supportive treatment. Early action improves outcomes for lily and permethrin cases.

Sources & further reading

Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.

PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-25).

Related guides

Frequently Asked Questions

Do happy cats drool?: Some cats drool lightly when kneading or relaxed — this is behavioural and distinct from sudden heavy hypersalivation with distress, hiding, or vomiting.
Can dental disease cause drooling in cats?: Yes — painful teeth, gum disease, and oral ulcers cause drooling, pawing at the mouth, and reluctance to eat. See your vet for a mouth examination.
Is drooling an emergency in cats?: Sudden heavy drooling with known toxin exposure, difficulty breathing, collapse, or extreme lethargy is an emergency. Phone your vet or emergency clinic immediately.
Why does my cat drool in the car?: Motion sickness is common. Some cats also hyperventilate from stress. Ask your vet about safe anti-nausea options before long journeys.