Bleeding Bump on Your Dog: Causes and First Aid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

A bleeding bump on a dog is usually a surface wound, a ruptured cyst, or a small growth that has been scratched or rubbed open. Most of these bleeds are minor and stop with steady pressure, but a bump that keeps bleeding, spurts blood, or sits on a dog with a bleeding disorder needs a veterinarian right away. This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

• Apply firm, steady pressure with a clean gauze pad or towel for at least 3 to 5 minutes without lifting to peek.
• Do not squeeze, poke, or try to pop the bump, because that can restart bleeding and push bacteria deeper.
• A bump that keeps bleeding after 10 minutes of pressure, or that bleeds in a steady stream or spurt, is an emergency.
• A soft, dark red or purple bump that suddenly appears may be a blood-filled pocket (hematoma) and should be checked by a veterinarian.
• If your dog has a known bleeding disorder, is on blood thinners, or has a history of severe bleeding, call your veterinarian before you do anything else.

What a Bleeding Bump Usually Looks Like

Owners describe this problem in a few common ways. There is a raised lump, and when the dog scratches it, licks it, or rubs it against something, the surface opens and blood appears. Sometimes the bump itself is filled with blood and looks like a dark, squishy balloon under the skin. Other times the bleeding comes from a small sore on top of a growth.

Normal bleeding from a minor surface wound is a slow ooze of bright red blood that slows within a minute or two of pressure. It should not pulse, spray, or soak through more than one gauze pad. The skin around it should look pink or mildly red, not black, gray, or foul-smelling.

Bleeding that is normal for a small scrape:

• Bright red color
• Slow ooze or a few drops
• Slows with light pressure
• Stops within a few minutes

Bleeding that is not normal:

• Steady stream or spurting
• Soaks through multiple pads
• Restarts every time you lift your hand
• Comes with pale gums, weakness, or collapse

Main Causes of a Bleeding Bump on a Dog

Many things can cause a lump that bleeds. The table below groups the most common ones by what you are likely to see and how quickly you need help.

Some bleeding problems are tied to how the blood clots. Dogs with von Willebrand disease and hemophilia A may need plasma products such as cryoprecipitate to control or prevent hemorrhage, and these transfusions have been used safely in dogs with hemostatic disorders [1]. A separate inherited clotting issue called delayed postoperative hemorrhage has been linked to a variant in the SERPINF2 gene, and this variant has been found in sighthounds as well as in other breeds including Shiba Inu, French Bulldog, Boston Terrier, Jack Russell Terrier, and Chihuahua [2]. That means breed alone does not tell the whole story.

Bleeding lumps are not always on the skin surface. A mass in or near an organ can bleed internally. In one reported case, an 11-year-old dog with an Addisonian crisis had a mass-like lesion on the right adrenal gland that was invading the vena cava, and imaging a year later showed the lesion had resolved [3]. This is a reminder that a "bump" your veterinarian finds on imaging may have a cause that is not cancer.

Cancer is another reason lumps need to be checked. Tumor-bearing dogs without intracavitary hemorrhage had lower hematocrit and higher reticulocyte counts than healthy dogs in one study, which shows that cancer can affect blood values even before obvious bleeding [4]. Blood work alone does not prove or rule out cancer, but it helps your veterinarian see the whole picture.

Dog Bump on Face Bleeding

Bumps on the face bleed more than you might expect because the face has a rich blood supply. A bleeding lump near the eye, nose, mouth, or ear can also interfere with breathing, eating, or vision. Do not wrap the whole head to control bleeding. Use a gauze pad and direct pressure, and keep your dog calm. If the bleeding is coming from inside the mouth or nose and will not stop, treat it as an emergency.

Dog Bump Filled With Blood

A bump that feels like a water balloon and looks dark red or purple is often a hematoma, which is a pocket of blood under the skin. Hematomas can form after a bump, a bite, or vigorous scratching. They can also form inside the body. Small hematomas sometimes reabsorb on their own, but large ones can keep expanding and may need to be drained or treated by a veterinarian. Never lance a hematoma at home.

Dog Bump Keeps Bleeding

If a bump keeps bleeding, the cause may be a clotting problem, a growth with a fragile blood supply, or repeated trauma from your dog licking or scratching it. Dogs with a bleeding disorder may bleed from the same spot again and again or from several spots at once. A bump that reopens every day, or that bleeds longer than expected each time, needs a veterinary exam and likely blood work.

Red Flags That Make It an Emergency

Call an emergency clinic or your veterinarian right away if you see any of these:

• Bleeding that does not slow after 10 minutes of steady pressure
• Blood that spurts or pulses with each heartbeat
• Bleeding from the nose, mouth, rectum, or multiple spots at once
• Pale, white, or blue gums
• Weakness, wobbling, collapse, or trouble breathing
• A lump that is growing quickly or feels hot and very painful
• Bleeding after recent surgery, especially in a sighthound or a breed linked to delayed postoperative hemorrhage [2]
• Any bleeding in a dog with a known bleeding disorder or a dog taking a blood thinner

Internal bleeding can be hard to see. A dog with a bleeding tumor inside the chest or abdomen may only show weakness, a swollen belly, or difficulty breathing. If your dog is suddenly weak or has a distended abdomen, go to the emergency clinic now.

Safe Things You Can Do at Home While You Wait

Your job at home is to slow the bleeding and keep your dog calm until you can get help. Stay calm yourself, because your dog reads your energy.

1. Put on gloves if you have them. If not, wash your hands well afterward.
2. Place a clean gauze pad, a folded paper towel, or a clean cloth over the bump.
3. Press firmly and steadily. Do not lift the pad to check every few seconds. Hold for at least 3 to 5 minutes.
4. If blood soaks through, add another pad on top. Do not remove the first one, because that can pull the clot off.
5. Keep your dog quiet. A calm dog bleeds less than a dog who is pacing or struggling.
6. If the bump is on a leg or paw, you can gently wrap the area with self-adhering bandage, but keep it snug, not tight. If the toes swell or turn cool, the wrap is too tight and should be loosened.
7. Do not give any human pain medication. Many common pain drugs are toxic to dogs. Your veterinarian will choose a safe medication and calculate the dose based on your dog's weight and health.
8. Do not apply powders, flour, or home remedies to a bleeding lump. They can trap bacteria and make the wound harder to clean.

If the bleeding is from a paw or ear that your dog keeps licking or scratching, the same pressure rules apply. For related problems, see Dog Licking Paws Making Them Bleed: Emergency First Aid, Stop Bleeding & Safe Wraps and Dog Scratching Ears Making Them Bleed. If your dog keeps scratching an ear until it bleeds, that repeated trauma can keep a lump open, so read Dog Scratching Ears And Bleeding as well.

What Your Veterinarian Will Check and Test

Your veterinarian will start with a full physical exam. They will look at the bump, measure it, check its texture, and look for other lumps. They will also check your dog's gums, heart rate, and breathing to judge how much blood may have been lost.

Common tests include:

• A complete blood count to check red blood cells and platelets
• A chemistry panel to check organ function
• A clotting profile, including tests for von Willebrand factor and other clotting factors
• Fine needle aspiration or biopsy of the lump to see what kind of cells are inside
• Imaging such as X-rays or ultrasound if internal bleeding or a deeper mass is suspected

If your dog has a bleeding disorder, treatment may include plasma products. Cryoprecipitate transfusions have been used in dogs with von Willebrand disease, hemophilia A, and other bleeding risks, often around surgery, and some dogs received other blood products or hemostatic medications at the same time [1]. Your veterinarian will decide what your dog needs based on test results, not on the size of the bump alone.

For a bleeding lump, the visit often ends with one of a few plans: watch and monitor, remove the lump, treat an infection, or manage an underlying clotting problem. If the lump is a hematoma, your veterinarian may drain it or leave it to reabsorb, depending on its size and location.

Prevention and Monitoring

You cannot prevent every lump, but you can lower the odds that a small one becomes a bleeding problem.

• Check your dog's skin once a week. Run your hands over the whole body, including the face, ears, paws, and tail base.
• Note the size and location of any lump. Take a photo with a ruler next to it so you can compare later.
• Keep nails trimmed and treat itchy skin, because scratching is a common reason a bump opens.
• Use flea, tick, and allergy control as directed by your veterinarian.
• Do not let your dog lick or chew a lump. A cone or a light wrap can help during healing.
• Keep a written record of any bleeding episodes, including how long they lasted and what stopped them.
• Tell your veterinarian about any breed-related bleeding risk. The SERPINF2 variant linked to delayed postoperative hemorrhage has been found in several breeds, including sighthounds and some non-sighthound breeds [2].

If your dog has had a bleeding problem before, ask your veterinarian whether any special preparation is needed before surgery or dental work. Cryoprecipitate has been used before, during, and after surgery in dogs with bleeding disorders to prevent or treat hemorrhage [1]. Planning ahead is safer than reacting later.

Limitations and When to Contact a Veterinarian

This article cannot tell you what your dog's bump is. Only a veterinarian who examines your dog can do that. Individual cases need a veterinarian, and the timing below is a guide, not a rule.

Contact your veterinarian the same day if:

• The bump bled but stopped, and you are not sure why it bled
• The bump is red, hot, swollen, or draining pus
• Your dog is licking or scratching the area constantly
• The lump changed size, shape, or color

Go to an emergency clinic now if:

• Bleeding will not stop after 10 minutes of firm pressure
• Blood is spurting or soaking through pads
• Your dog is weak, pale, wobbly, or having trouble breathing
• Bleeding started after recent surgery
• Your dog has a known bleeding disorder and is bleeding from any site

Schedule a routine visit if:

• The lump is small, dry, and not bleeding
• Your dog seems comfortable and is eating and drinking normally
• You want a baseline check and a plan for monitoring

Frequently Asked Questions

Should I put a bandage on a bleeding bump on my dog?

You can use a light wrap on a leg or paw, but keep it snug, not tight. For most other spots, direct pressure with a gauze pad is safer than a full bandage, because a wrap that slips can hide bleeding or cut off circulation. If the toes swell or feel cool, loosen the wrap and call your veterinarian.

Can a blood-filled bump on a dog go away on its own?

Small hematomas sometimes reabsorb over days to weeks, but large or growing ones often need veterinary care. A blood-filled bump can also be a sign of a bleeding disorder or a tumor, so it should be examined. Do not drain it at home, because that can cause infection and more bleeding.

Why does my dog's lump keep bleeding after it scabs over?

Repeated licking, scratching, or rubbing pulls the scab off and restarts bleeding. In some dogs, an underlying clotting problem makes each bleed last longer than expected. If the same lump reopens more than once or twice, have your veterinarian examine it and consider blood work.

Is a bleeding lump on my dog always cancer?

No. Many bleeding lumps are warts, cysts, abscesses, or hematomas. Cancer is one possible cause, and some tumors can bleed, so a veterinarian should look at any lump that bleeds without a clear injury. A fine needle sample or biopsy is the only way to know what the cells are.

What should I do if my dog has a bleeding disorder and a bump is bleeding?

Apply firm pressure and call your veterinarian or an emergency clinic immediately. Dogs with von Willebrand disease, hemophilia, or a history of delayed postoperative hemorrhage may need plasma products or other treatment to control bleeding [1][2]. Do not wait to see if it stops on its own.

Related Articles

• Dog Scratching Ears Making Them Bleed
• Dog Scratching Ears And Bleeding
• Dog Licking Paws Making Them Bleed: Emergency First Aid, Stop Bleeding & Safe Wraps
• Dog Scratching Ears Till Bleeding
• Dog Scratching Ear To Point Of Bleeding
• Dog Scratching Ears Until They Bleed
• Dog Lump Keeps Bleeding: Causes and When to Worry
• Bleeding or Ulcerated Skin Tag on a Dog: What to Do
• Signs of Internal Bleeding in Dogs: When to Act

References

1. Retrospective Evaluation of Cryoprecipitate Transfusion in Dogs to Prevent or Treat Hemorrhage: 21 Cases (2009-2023). Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001), 2025.
2. Frequencies of the SERPINF2 c.605C>T variant implicated in delayed postoperative hemorrhage among dog breeds at a single referral center in Japan. The Journal of veterinary medical science, 2026.
3. Vena Caval Hematoma Secondary to Adrenal Hemorrhage From an Addisonian Crisis in a Dog. Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026.
4. Alterations in Erythrocyte and Platelet Characteristics Are Poor Indicators of Metastasis in Dogs with Carcinoma or Sarcoma: A Preliminary Study. Veterinary sciences, 2026.

Further Reading

• American Veterinary Medical Association: First Aid Tips for Pet Owners
• Merck Veterinary Manual: Dog Owners
• Cornell Richard P. Riney Canine Health Center: Canine Health Information