Why is my dog's gums bleeding?
Bleeding gums in a dog are most often caused by gum disease or an injury in the mouth, but they can occasionally be a sign of something more serious affecting how the blood clots. See a vet promptly rather than waiting to see if it settles, especially if the bleeding is ongoing, heavy, or your dog has other symptoms alongside it.
Get this seen
This is worth a call to your vet rather than waiting to see how it goes, particularly if it has lasted more than a day or your pet is otherwise off-colour.
The common causes
Gum disease is by far the most frequent cause, and it builds up gradually as plaque and tartar accumulate along the gum line, causing inflammation that bleeds easily, particularly when your dog chews something firm or you touch the area. Most dogs with this have some visible tartar on their teeth and breath that is noticeably off.
An injury in the mouth is the other common cause — a stick chewed too enthusiastically, a sharp piece of bone, or a hard toy caught awkwardly against the gum. These tend to cause bleeding from one specific spot rather than generally along the gum line, and often settle on their own within a day if the injury is minor.
Less common but more serious causes
Bleeding gums alongside bruising elsewhere, blood in the urine or stools, or nosebleeds can point to a problem with how your dog's blood is clotting, which is a different and more urgent situation than a straightforward dental issue. A growth or mass in the mouth is another less common cause worth ruling out, particularly in an older dog.
Certain rodenticide poisons work by stopping blood from clotting properly, so if there is any chance your dog could have accessed rat or mouse poison, tell your vet immediately regardless of how minor the bleeding looks, since this is treatable but time matters.
When to see a vet, and how urgently
Bleeding that is heavy, will not stop, or comes with pale gums, unusual bruising, or your dog seeming generally unwell needs to be seen the same day. A dog who is otherwise bright and eating normally with a small amount of blood after chewing something hard can usually be seen on a routine appointment, but it is still worth ringing to ask.
Do not attempt to treat bleeding gums at home beyond gently checking for an obvious object caught in the mouth. A vet needs to examine the mouth properly, and possibly under sedation, to see what is actually causing it, which is not something you can reliably do yourself.
Keeping on top of dental health afterwards
Once a vet has checked your dog over and ruled out anything more serious, ongoing dental care is what keeps gum disease from becoming a repeat problem. Regular brushing with a dog-specific toothpaste, and dental chews designed to reduce plaque build-up between brushes, both make a real difference over time.
This is maintenance, not treatment for gums that are currently bleeding — do not start a new dental chew or begin brushing an actively sore mouth without your vet's say-so first. Once you have the all-clear, building a routine around it is one of the most useful everyday things you can do for your dog's teeth.
What can help
Things we stock that owners commonly use alongside a vet’s advice — not a substitute for it.
MPS Head Cover — Breathable Dog Head & Ear Protector
A comfortable, breathable alternative to the cone of shame — protects head and ear wounds or bandages while letting your dog move freely.
From£5.99
Leucillin Antiseptic Skincare Spray for Cats & Dogs
A versatile, alcohol-free antiseptic spray that cleans, soothes, and helps protect your pet's skin from bacteria, viruses, and fungi.
From£7.99
Absorbent Cotton Gauze Swabs for Pets – Pack of 100
Highly absorbent, low-lint cotton gauze swabs produced in clean conditions — a practical first-aid essential available in three size and ply combinations.
From£4.49
NanoSanitas Advanced No-Brush Dental Gel for Dogs & Cats
A brush-free dental gel for dogs and cats, formulated with silver nanoparticles and papaya extract to help reduce plaque and freshen breath.
£14.99
Common questions
- Should I be worried if my dog's gums bleed a little after chewing a bone?
- A small, one-off amount of bleeding that stops quickly and does not recur is usually just a minor knock to the gum. If it keeps happening, is heavy, or your dog seems uncomfortable in the mouth, it is worth a vet check rather than assuming it will keep sorting itself out.
- Can gum disease in dogs be reversed?
- Early gum inflammation often improves once tartar is professionally removed and a good home dental routine is kept up afterwards. More advanced gum disease can cause lasting damage to the tissue and bone supporting the teeth, which is why catching and treating it earlier gives a much better outcome.
- What if my dog's gums are bleeding and they also have bruises on their skin?
- This combination needs a vet the same day. Bleeding gums alongside bruising elsewhere can point to a problem with blood clotting, which is a different and more urgent situation than ordinary gum disease, and it is not something to wait out at home.
- Can brushing my dog's teeth make bleeding gums worse?
- It can, if the gums are already inflamed or sore, which is why starting or continuing a brushing routine on actively bleeding gums without checking with a vet first is not a good idea. Once a vet has looked at the cause and it has settled, gentle regular brushing generally helps rather than harms.
- Are some dog breeds more prone to gum disease?
- Smaller breeds and those with crowded teeth tend to build up tartar more readily and are seen with gum disease more often than larger breeds with more evenly spaced teeth. Regardless of breed, a consistent dental routine and regular vet checks make the biggest difference to how much of a problem it becomes.
- How will the vet find out what's causing the bleeding?
- Usually a physical examination of the mouth first, which for a nervous or painful dog may need to be done under light sedation to get a proper look. Depending on what they find, blood tests are sometimes added to rule out a clotting problem alongside the more common dental causes. Diet plays a smaller supporting role too: very soft food with nothing to chew on can let tartar build up faster than a diet that includes some dental chews or dry kibble.
Related
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Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.