Bleeding Gums in Dogs: Causes and What to Do

A little pink on the toothbrush, a red smear on a chew toy, blood in your dog's water bowl: bleeding gums in dogs are easy to spot and hard to read. Most of the time the cause is ordinary, but now and then it's the first visible sign of something that needs a vet today.

Quick answer: Dog bleeding gums are most often caused by gingivitis, gum inflammation from plaque and tartar along the gum line. In puppies of roughly 3 to 6 months, a little bleeding is usually just teething. Bleeding that won't stop, or bleeding gums together with pale gums, bruising, nosebleeds or weakness, can mean a clotting problem or rat poison and is an emergency, so see a vet straight away.

Below, we go through the common causes, how to tell a minor problem from an emergency, what you can do at home, and how to keep your dog's gums healthy.

Why Are My Dog's Gums Bleeding? The Most Common Causes

Healthy dog gums are pink (or naturally pigmented black in some dogs), firm and don't bleed when touched. When they do bleed, it's usually one of the causes below, roughly in order of how often vets see them.

1Gingivitis: the number one cause

Gingivitis is inflammation of the gums, and it's by far the most common reason dogs' gums bleed. Plaque, a sticky film of bacteria, builds up on the teeth every day. If it isn't brushed away, it hardens into tartar along the gum line within days, and the bacteria irritate the gums.

Inflamed gums look red or dark pink, may be slightly swollen along the edge of the teeth, and bleed easily when brushed or when your dog chews something hard. Bad breath usually comes with it.

The good news: gingivitis is the only stage of dental disease that can be fully reversed. With a professional cleaning where needed and regular brushing afterwards, the gums can return to normal.

2Periodontal disease

Left untreated, gingivitis progresses to periodontal disease: the infection works its way below the gum line and starts destroying the tissues and bone that hold the teeth in place. Gums recede, pockets form around the teeth, and teeth eventually loosen and fall out. This damage can't be reversed, only stopped.

Periodontal disease is extremely common in adult dogs, especially as they get older. Small breeds and brachycephalic (short-nosed) breeds like the pug, bulldog and Shih Tzu are particularly prone, because their teeth are crowded together and trap plaque. Genetics and a poor bite (malocclusion) play a role too.

Treating it requires a professional dental cleaning under anesthesia, usually with dental X-rays to check the roots, and sometimes extractions of teeth that can't be saved. If anesthesia worries you, our guide to dog teeth cleaning under anesthesia explains the risks and why it's needed.

3Dog gums bleeding when brushing

If your dog's gums bleed when brushing, the brushing itself is rarely the real problem. A tiny bit of bleeding can happen if you scrub too hard or use a stiff brush, but gums that bleed regularly are usually already inflamed, which points back to gingivitis.

That's also the most common way owners find out: you start brushing, see blood, and wonder whether to stop. In most cases you shouldn't stop, but you should switch to a gentler technique and have your vet look at the mouth. We cover exactly how in the section on whether to keep brushing, further down.

4Mouth injuries and cuts

Oral trauma is common in dogs, especially young dogs that chew on everything. Sticks, bones, antlers, hard plastic toys and sharp-edged objects can cut the gums or tongue, splinter between the teeth, or break a tooth (dog teeth aren't as tough as many people think).

The mouth has a rich blood supply, so even a small cut can look alarming, with blood in the saliva, on toys and in the water bowl. Many small cuts stop bleeding on their own within a few minutes. Bleeding that doesn't stop, a deep wound, a broken tooth, or something stuck in the mouth or between the teeth needs a vet as soon as possible. Don't force your dog's mouth open or try to pull out a stuck object yourself, as you can make the injury worse or get bitten.

5Stomatitis

Stomatitis is widespread, painful inflammation of the inside of the mouth. Unlike gingivitis, it doesn't stay at the gum line: it can affect the inner lips, cheeks, the floor and roof of the mouth, and the tongue, often with ulcers where the gums touch the teeth.

The exact cause isn't fully understood, but it's thought to involve the immune system overreacting to the bacterial plaque on the teeth. Affected dogs often have very bad breath, drool, are reluctant to eat, and may stop grooming because using their mouth hurts. Stomatitis needs veterinary treatment, which often includes a thorough dental cleaning and sometimes extraction of affected teeth.

6Oral growths in older dogs

In middle-aged and older dogs, a lump on the gums that bleeds can be an oral tumor. Many gum growths are benign, but some are cancerous, and they're much easier to treat when caught early. Any new lump, swelling or bleeding spot in an older dog's mouth is worth a vet visit, even if your dog seems fine otherwise.

7Clotting problems, rat poison and other illness

Less commonly, bleeding gums are a sign that the blood itself isn't clotting properly. This is the cause you don't want to miss:

Rat and mouse poison (anticoagulant rodenticides) stop the blood from clotting. Signs often don't show until several days after your dog ate the bait, and can include bleeding gums, nosebleeds, bruising, blood in the urine or stool, coughing, weakness and pale gums.
Low platelet counts, for example from immune-mediated disease or tick-borne infections such as ehrlichiosis.
Inherited bleeding disorders such as von Willebrand disease, which is more common in some breeds, including the Doberman.
Other systemic illness, such as liver disease or advanced kidney disease, which can cause mouth ulcers and bleeding.

These dogs usually bleed from more than just the mouth or seem unwell in other ways, which is why the next section matters.

When Bleeding Gums Are an Emergency

Treat it as an emergency and go to a vet or emergency clinic straight away if you notice bleeding gums together with any of these:

Pale, white or gray gums instead of healthy pink
Bruising on the skin, or tiny red-purple spots on the gums, belly or inner ears
Nosebleeds, blood in the urine, black or bloody stool, or coughing up blood
Weakness, lethargy, fast breathing or collapse
Bleeding that doesn't stop after 5 to 10 minutes of gentle pressure, or heavy bleeding from the mouth
Any chance your dog ate rat or mouse poison, even if they seem fine. Bring the packaging with you if you can

Rodenticide poisoning is very treatable when it's caught early, so don't wait for symptoms to get worse. If you suspect poisoning, you can also call a pet poison helpline on the way to the vet.

Book a vet visit within a few days (not an emergency) if your dog has bleeding gums with bad breath, red or swollen gums, tartar, a loose or broken tooth, drooling, or reluctance to eat hard food.

Puppy Gums Bleeding: Is Teething Normal?

Yes. If your puppy is somewhere between about 3 and 6 months old and you find small spots of blood on chew toys, a bit of pink in the saliva, or even a tiny tooth on the floor, teething is the most likely explanation.

Puppies have 28 baby (deciduous) teeth, which are replaced by 42 adult teeth. The baby teeth start falling out at around three to four months, and most puppies have their full set of adult teeth by six to seven months. As each baby tooth loosens and falls out, the gum can bleed a little. Most owners never see the teeth themselves, because puppies often swallow them, which is harmless.

Normal teething looks like:

Small amounts of blood on toys or in the water bowl
Extra chewing, mild drooling and slightly red gums
A puppy that's otherwise eating, playing and acting normally

See your vet if:

The bleeding is more than a few spots, or doesn't stop
A baby tooth is still in place when the adult tooth has come in next to it (a retained baby tooth, common in small breeds, which usually needs removing)
Your puppy has pale gums, seems lethargic, stops eating, or bleeds anywhere else
You see a broken tooth, or the gums look badly swollen or infected

To make teething easier, give your puppy soft rubber teething toys or a wet, frozen washcloth to chew on, and avoid hard bones, antlers and hooves that can break teeth. This is also a good time to start getting your puppy used to having its mouth handled and to a soft finger brush, gently and in short sessions.

Other Signs to Check For

If you've noticed bleeding gums, look for these other signs too. They help you and your vet narrow down the cause:

Bad breath (halitosis), one of the earliest signs of gum disease
Red, dark pink or swollen gums, especially along the gum line
Brown or yellow tartar on the teeth
Loose, broken or missing teeth
Drooling, pawing at the mouth, or dropping food
Chewing on one side or avoiding hard kibble and toys
Reduced appetite or weight loss
Blood on toys, bedding or in the water bowl
A lump or swelling on the gums or face

How the Vet Finds the Cause

At the vet, your dog gets an oral exam and a general physical exam. The vet will ask when you first noticed the bleeding, whether it's getting worse, what your dog chews on, and whether there's any chance of contact with rodent poison.

For straightforward gingivitis, the exam is often enough to plan a dental cleaning. A full assessment of the teeth and gums, including probing the gum pockets and dental X-rays, has to be done under anesthesia, because dogs won't keep still for it.

If a clotting problem or other illness is suspected, your vet may run blood tests (including a platelet count and clotting times), a urine test, or tests for tick-borne disease. Any growth may be biopsied. Treatment depends on the cause: a professional cleaning and home care for gum disease, extractions for badly damaged teeth, repair of injuries, or medication such as vitamin K1 for rodenticide poisoning.

Dog Bleeding Gums Home Treatment: What You Can Do

Home care helps with mild gum inflammation and small injuries, but it can't remove tartar under the gum line or fix a clotting problem. Use it alongside, not instead of, a vet check.

For a small cut that's bleeding: if your dog lets you, hold a clean, damp gauze pad or cloth against the spot with gentle pressure for a few minutes. Many small mouth cuts stop on their own. If it doesn't stop within 5 to 10 minutes, go to the vet.
Offer softer food for a few days if the gums are sore, for example soaking kibble in warm water.
Remove hard chews such as bones, antlers and hard nylon toys while the gums heal.
Keep brushing gently with a soft brush and dog toothpaste, unless your vet says otherwise (see below).
Ask your vet about an oral rinse or gel. Vets often recommend chlorhexidine-based products made for pets to reduce plaque bacteria while the gums heal.
Don't use human products. Human toothpaste and some mouthwashes and gum can contain xylitol, which is toxic to dogs (our xylitol toxicity calculator shows how little it takes). Don't use hydrogen peroxide, baking soda or salt scrubs on your dog's gums either.

Should You Keep Brushing a Dog With Bleeding Gums?

In most cases, yes, gently. Bleeding from mild gingivitis is a reason to keep brushing, because removing the plaque is what lets the gums heal. Mild gingivitis often improves noticeably within a couple of weeks of regular, gentle brushing.

Make it easier on sore gums:

Use a soft-bristled dog toothbrush or finger brush, and only dog toothpaste
Angle the bristles at about 45 degrees towards the gum line and use small, gentle circles, not hard scrubbing
Keep sessions short and positive, and focus on the outer surfaces of the teeth, where most tartar builds up
Aim for daily brushing; every other day still helps

Stop and see your vet first if the bleeding is heavy, gets worse over a week or two, or your dog flinches or seems to be in pain. Brushing over painful, infected teeth won't fix them and can make your dog hate the toothbrush. If your dog already fights you on it, our guide on how to brush a dog's teeth that hates being brushed walks through a step-by-step approach.

How to Prevent Bleeding Gums in Dogs

Most bleeding gums come from plaque, so prevention mostly comes down to keeping plaque under control:

Brush your dog's teeth daily. Brushing is the most effective way to prevent gum disease. Start in puppyhood if you can, and be extra gentle while your puppy is teething.
Use dental products with the VOHC seal. The Veterinary Oral Health Council lists chews, diets, water additives and other products that have been shown to reduce plaque or tartar. They help, but don't replace brushing.
Choose safe chews. Avoid anything so hard you can't dent it with a fingernail, such as bones, antlers and hooves, which can fracture teeth and cut gums.
Schedule regular checkups. Have your vet check your dog's mouth at least once a year, and book professional cleanings when your vet recommends them. Small breeds often need them more often.
Keep rodent poison out of reach, or better, use pest control that doesn't rely on anticoagulant baits. Remember that dogs can find bait in neighbors' yards and on walks.
Watch for early signs. Bad breath and red gum lines are the cue to step up home care and get a vet check, before gingivitis turns into periodontal disease.

Fresh breath is a nice side effect of healthy gums. If bad breath persists, our roundup of dog treats for bad breath covers dental chews that can help alongside brushing.

FAQ

Why are my dog's gums bleeding?

The most common reason for dog bleeding gums is gingivitis, inflammation caused by plaque and tartar at the gum line. Other causes include teething in puppies, mouth injuries from chewing, stomatitis, oral growths and, less often, clotting problems such as rat poison or low platelets.

Is it normal for puppy gums to bleed?

A little bleeding is normal while a puppy is teething, roughly between 3 and 6 months of age, as baby teeth fall out and adult teeth come in. Heavy bleeding, bleeding that doesn't stop, a baby tooth that stays put next to an adult tooth, or a puppy that seems unwell are reasons to see a vet.

When are bleeding gums in dogs an emergency?

Go to a vet straight away if bleeding gums come with pale gums, bruising, nosebleeds, blood in the urine or stool, weakness or lethargy, if the bleeding won't stop, or if your dog may have eaten rat or mouse poison.

How can I stop my dog's gums from bleeding at home?

For a small cut, gentle pressure with a clean, damp cloth for a few minutes usually stops it. For gums that bleed from gingivitis, gentle daily brushing with a soft brush and dog toothpaste, plus a vet-recommended oral rinse, helps the gums heal. Tartar below the gum line needs a professional cleaning, and you should never use human toothpaste or mouthwash.

Should I stop brushing if my dog's gums bleed?

Usually not. Light bleeding during brushing is typically from gingivitis, and gentle, regular brushing is what helps it heal. Switch to a softer brush and lighter pressure, and stop and see your vet if the bleeding is heavy, getting worse, or your dog seems in pain.

Can bleeding gums in dogs heal on their own?

Gums that bled from a minor scrape or teething usually heal on their own within days. Gingivitis can be reversed, but only once the plaque and tartar causing it are removed by cleaning and brushing. Periodontal disease doesn't heal on its own and needs veterinary treatment.

Final Thoughts

Bleeding gums in dogs are usually a sign of gingivitis, and in puppies, often just teething. Both respond well to the right care: gentle daily brushing, safe chews and regular dental checkups.

What matters most is knowing when it's more than that. Bleeding that won't stop, or bleeding gums with pale gums, bruising, weakness or a possible run-in with rat poison, needs a vet straight away. For everything in between, a routine vet check will tell you whether your dog needs a dental cleaning or just a better brushing routine.