Bruises on dogs look similar to bruises on people, showing up as dark red or purple discoloration on the skin, but they’re much harder to spot because fur covers most of the body. You’re most likely to notice them on areas with less hair, like the belly, inner thighs, armpits, gums, ears, and the whites of the eyes. Bruising in dogs takes two main forms: tiny pinpoint red-to-purple dots, or larger blotchy patches of dark red or purple.
Two Types of Bruising to Look For
The smaller type looks like a scattering of pinpoint red or purple specks, almost like someone flicked a pen across your dog’s skin or gums. These specks are less than 3 millimeters across, roughly the size of a pinhead. They often cluster together and can be easy to mistake for a rash or flea dirt at first glance.
The larger type looks more like what you’d recognize as a traditional bruise: blotchy patches of dark red or purple that can spread across a section of skin. These can range from about the size of a dime to covering a significant area of the belly or inner leg. A deep bruise may also cause visible swelling or feel warm to the touch.
Both types represent bleeding under the skin, but they can signal different problems. Pinpoint speckling often points to issues with platelets, the tiny blood cells responsible for clotting. Larger blotchy bruises can result from either platelet problems or deeper issues with the clotting system itself. A firm, raised lump filled with blood, sometimes seen on the ear flap, is a hematoma, which is a more concentrated collection of blood in one spot.
Where to Check on Your Dog
Fur makes bruising nearly invisible across most of a dog’s body. If you suspect bruising, focus on areas where skin is thinnest and least covered:
- Belly: Gently roll your dog over or lift their front legs. The belly skin is typically pale and sparsely furred, making discoloration easier to spot.
- Gums: Lift your dog’s lip and look at the gum tissue above the teeth. Healthy gums are pink. Pinpoint red or purple dots here are a significant finding.
- Armpits and inner thighs: These areas have thin, lightly pigmented skin in most breeds.
- Whites of the eyes: Red blotches or streaks on the normally white part of the eye indicate bleeding.
- Ears: The inner ear flap, especially in dogs with lighter skin, can show bruising clearly.
Dogs with heavily pigmented (dark) skin make this harder. On dark-skinned dogs, checking the gums and the whites of the eyes is your most reliable option, since those surfaces stay light-colored regardless of breed.
What Causes Bruising in Dogs
A bruise from a known bump or fall, like hitting a table leg or roughhousing with another dog, is usually straightforward and heals on its own. The concern arises when bruising appears without an obvious cause.
Unexplained bruising often signals a problem with your dog’s ability to clot blood. One common cause is immune-mediated thrombocytopenia, a condition where the immune system destroys the dog’s own platelets. Dogs with this condition can develop both pinpoint speckling on the gums and larger bruises across the belly and inner legs. Bleeding generally doesn’t become visible until the platelet count drops below about 40,000 per microliter, well under the normal range of 150,000 to 400,000.
Rat poison (rodenticide) ingestion is another frequent culprit. These products work by blocking the body’s ability to use vitamin K, which is essential for clotting. A dog who got into rodenticide days ago may look perfectly fine until bruising, bleeding from the gums, or blood in the stool suddenly appears. Tick-borne infections, liver disease, and certain cancers can also interfere with clotting and produce unexplained bruising.
Bruising on the Belly After Trauma
Bruising across the abdomen deserves special attention, particularly if your dog was recently hit by a car, fell from a height, or experienced any blunt impact. Visible bruising on the belly’s surface can be the external sign of internal bleeding. Many internal injuries don’t become apparent for hours or even days after the initial trauma.
A dog with internal abdominal bleeding may show a combination of belly bruising with a distended or bloated abdomen, weakness, pale gums, cool skin, rapid breathing, or collapse. Low blood pressure and shock can develop quickly. Even a dog that appears stable after a traumatic event can have substantial underlying injury, so a swelling or spreading bruise on the belly after any kind of impact warrants urgent evaluation.
When Bruising Is Concerning
A single small bruise with a clear cause, like a bump during play, that stays in one spot and fades within a few days is typically not alarming. The red flags are about pattern and progression.
Bruising that spreads beyond its original area, appears in multiple locations at once, or doesn’t improve within 72 hours suggests something beyond a simple bump. Pay attention to any accompanying symptoms: weakness, trouble breathing, pale gums, loss of appetite, vomiting, extreme tiredness, or neurologic changes like a wobbly gait, tremors, or seizures. If bruising is paired with any of these signs, your dog needs veterinary evaluation quickly.
Bruising that oozes, becomes increasingly painful, or swells significantly also points toward a more serious underlying issue rather than a routine injury. If you don’t know what caused the bruise in the first place, that alone is reason enough to have your dog checked, since the bruise may be the first visible sign of a clotting disorder, poisoning, or organ disease that hasn’t shown other symptoms yet.
What a Vet Visit Looks Like
When you bring a bruised dog in, the vet’s first step is checking basic blood values: a packed cell volume (which shows whether your dog is losing red blood cells internally), total protein levels, and a blood smear to estimate the platelet count. A normal platelet estimate under the microscope shows 8 to 15 platelets per field. If that number is very low, it confirms a clotting issue.
From there, specific clotting time tests help narrow down whether the problem is with platelets, with the clotting cascade itself, or both. These results, combined with your dog’s history and symptoms, guide treatment. The process is quick, usually requiring just a few blood draws, and gives the vet a clear picture of what’s going wrong.