A bit of drool is part and parcel of life with a dog, and for some breeds it's practically a personality trait. The short answer is this: drooling around food, excitement or a warm day is completely normal, but a sudden, heavy, out-of-character flood of saliva can signal heat trouble, nausea, a dental problem, or something stuck in the mouth, and that's when you should act. Knowing your dog's usual drool level is the key to spotting when something's changed.
Some dogs are simply born droolers. Others barely leave a mark. The trick is telling ordinary slobber from the kind of sudden, excessive drooling that means your dog needs help. Here's how I tell the difference.
Normal drooling
Drooling is just the flow of saliva from the mouth, and plenty of it is entirely normal. Expect a bit more when your dog is:
- Anticipating food: the classic dinnertime drool
- Excited or aroused: before a walk, during play or meeting people
- Warm: panting on a hot day naturally comes with extra saliva
- A "drooly" breed: loose-lipped dogs like Boxers, Bulldogs, Mastiffs, Saint Bernards and Bloodhounds drool far more by design
If the drooling fits the moment and your dog is otherwise themselves, it's nothing to worry about. It's the sudden change from your dog's normal that matters most.
When drooling is excessive
Excessive drooling means noticeably more than usual for your dog, often coming on suddenly. Common causes include:
- Heat and heatstroke: thick, ropey drool on a hot day can be an early warning of overheating
- Nausea: many dogs drool heavily just before being sick, or with travel sickness in the car
- Dental problems: a sore tooth, gum disease or an abscess can trigger drooling, sometimes with bad breath or reluctance to eat
- Something stuck: a stick, bone, toy or grass seed caught in the mouth or throat causes sudden drooling, pawing at the mouth and gagging
- Something they've eaten: bitter tastes or toxins can prompt a rush of saliva
- Mouth injuries or sores: cuts, ulcers or foreign objects
The pattern is the clue. Predictable drool that fits the situation is fine. A sudden, heavy, unexplained flood, especially with any sign of distress, is your dog telling you something's wrong.
Vet note: Sudden heavy drooling on a hot day, alongside frantic panting, wobbliness or bright red gums, can mean heatstroke, which is a life-threatening emergency. Move your dog somewhere cool, offer small sips of water, and ring your vet straight away. You can read more on heatstroke in dogs.
The dental link
Mouth and tooth trouble is one of the most common causes of new drooling that owners miss. If your dog has started drooling more and you also notice bad breath, dropping food, chewing on one side, pawing at the mouth or a reluctance to have their face touched, a dental check is well overdue. Dental disease is not only painful but very common, and it often creeps up quietly. Your vet can examine the mouth properly and sort out anything sore.
Red flags: call your vet
Contact your vet, or an out-of-hours emergency vet, if the drooling comes with:
- Signs of heatstroke: heavy panting, wobbliness, bright red or dark gums, collapse (an emergency)
- Suspected poisoning or eating something harmful, alongside a sudden rush of saliva
- Pawing at the mouth, gagging or difficulty swallowing, which can mean something is stuck
- Bad breath, bleeding gums or dropping food, pointing to dental pain
- Repeated vomiting or being generally unwell
- A sudden, unexplained change from your dog's normal drool
If you think your dog has eaten something toxic, you can also ring the Animal PoisonLine on 01202 509000, a paid UK service, but never wait to contact your vet in an emergency.
Frequently asked questions
Why is my dog suddenly drooling a lot?
A sudden increase can mean nausea, a dental problem, something stuck in the mouth, or overheating. If it comes on out of nowhere, especially with distress, gagging or signs of heatstroke, contact your vet.
Is drooling a sign of heatstroke in dogs?
It can be. Thick, ropey drool with heavy panting, wobbliness and red gums on a warm day is a heatstroke warning. Cool your dog down and ring your vet immediately, as it can worsen fast.
Can dental problems cause drooling?
Yes. A sore tooth, gum disease or a mouth injury commonly causes extra drooling, often with bad breath, dropping food or reluctance to eat. A vet dental check is the answer.
Do some breeds just drool more?
Absolutely. Loose-lipped breeds like Boxers, Bulldogs, Mastiffs, Saint Bernards and Bloodhounds naturally drool far more than others. For them it's normal, so watch for changes from their usual rather than the drool itself.
This isn't veterinary advice
We're professional dog groomers, not vets, so please treat this as friendly general guidance. If you're worried about your dog, or before acting on anything here, speak to your local vet. In an emergency, contact your vet or nearest out-of-hours clinic.
Fluffs is a professional dog grooming salon in Wigginton, York, offering one-to-one grooming for dogs of every breed and coat type across Haxby, Strensall, Huntington, New Earswick and the surrounding villages. We keep every groom calm and take care to keep dogs cool and comfortable throughout their visit. Book a relaxed, unhurried groom.