Bleeding Or Bruising in Dogs

See your vet immediately if your dog has unexplained bleeding or bruising. A bruise after a known bump or rough play may be minor, but spontaneous bruising is different. It can be a sign that blood vessels are leaking, platelets are too low, or the body cannot clot normally. In dogs, bleeding may show up as nosebleeds, bleeding gums, blood in urine or stool, pinpoint red spots on the skin or gums, or larger purple patches under the skin.

Some dogs only have a few spots on the belly or inside the ears. Others develop more serious signs such as pale gums, weakness, fast breathing, collapse, or a swollen belly from internal bleeding. Causes range from trauma to inherited disorders like von Willebrand disease, immune-mediated thrombocytopenia, tick-borne disease, liver disease, cancer, and anticoagulant rodenticide exposure. Because the list is broad and some causes are life-threatening, this symptom should not be watched at home for long without guidance from your vet.

The pattern of bleeding matters. Petechiae, which are tiny pinpoint red or purple spots, often raise concern for platelet problems. Deeper bleeding into tissues, joints, or body cavities can happen with clotting factor disorders. Your vet will use the history, exam, and lab work to sort out which part of the clotting system may be affected and how urgent treatment needs to be.

Common causes include trauma, bite wounds, nail injuries, and bleeding after surgery or a procedure. Those cases are often easier to connect to a recent event. More concerning causes include low platelet counts, called thrombocytopenia, platelet function problems, clotting factor deficiencies, severe liver disease, disseminated intravascular coagulation, and some cancers. Dogs with thrombocytopenia may develop petechiae, larger bruises, bloody urine, vomiting blood, black tarry stool, or bleeding from the nose or gums.

Toxins are another major cause. Anticoagulant rat poison can cause internal bleeding, weakness, breathing trouble, bruising, or collapse, often several days after exposure. Some human medications can also contribute to bleeding, especially if they irritate the stomach or affect clotting. Tick-borne infections such as anaplasmosis and ehrlichiosis can lower platelets in some dogs and lead to bruising or nosebleeds. Inherited disorders matter too. Von Willebrand disease can cause bruising, gum bleeding, nosebleeds, and excessive bleeding during surgery, especially in predisposed breeds.

Less common but important causes include splenic or other internal tumors that bleed, severe inflammation, heat-related illness, and bone marrow disease that reduces platelet production. Because bruising can come from very different problems, the same outward sign can lead to very different care plans. That is why your vet may recommend anything from basic blood work to emergency imaging and hospitalization.

See your vet immediately if your dog has active bleeding that does not stop, pale or white gums, weakness, collapse, trouble breathing, a swollen abdomen, vomiting blood, black tarry stool, blood in the urine, or bruising with no known injury. The same is true if you suspect rat poison exposure, a recent toxin exposure, or if your dog is bleeding after surgery longer than expected. These signs can point to internal bleeding or a serious clotting problem.

Urgent same-day care is also appropriate for new petechiae on the gums, belly, or ear flaps, repeated nosebleeds, bruises that are spreading, or any bruising paired with lethargy, poor appetite, fever, or lameness. Even if your dog seems comfortable, spontaneous bruising is not a symptom to ignore. Many dogs with platelet disorders can look fairly normal until bleeding becomes severe.

If there was a known minor bump and the bruise is small, not painful, and not getting larger, your vet may advise monitoring. Still, call if it is not improving within about 72 hours or if any new bleeding appears. Avoid giving human pain relievers unless your vet specifically tells you to, because some can worsen bleeding or cause stomach ulcers.

Your vet will start with a careful history and physical exam. Helpful details include when the bleeding started, whether there was trauma, any access to rat poison or human medications, recent surgery, tick exposure, breed history, and whether your dog has had nosebleeds, black stool, blood in urine, or weakness. On exam, your vet may look closely at the gums, belly, ear flaps, and whites of the eyes for petechiae or ecchymoses, and check for pale gums, abdominal pain, fluid, masses, or signs of shock.

Initial testing often includes a complete blood count to check platelets and red blood cells, a blood smear to manually review platelet numbers, chemistry testing to assess organs such as the liver, urinalysis, and clotting tests like PT and aPTT. Depending on the case, your vet may also recommend blood pressure, tick-borne disease testing, von Willebrand factor testing, chest X-rays, abdominal ultrasound, or other imaging to look for internal bleeding, cancer, or organ disease. In more complex cases, bone marrow testing may be discussed if platelet production is in question.

These tests help your vet decide whether the problem is mainly with platelets, clotting proteins, blood vessel injury, or an underlying disease driving the bleeding. That distinction matters because treatment for immune-mediated thrombocytopenia is very different from treatment for rat poison exposure, liver disease, or a bleeding splenic mass.

Home care depends on what your vet finds. If the bruise is minor and trauma-related, your vet may recommend rest, leash walks only, and watching the area for swelling, pain, or spread. Check your dog’s gums once or twice daily. Healthy gums are usually pink. Pale, white, or very tacky gums are more concerning. Also monitor appetite, breathing, energy level, stool color, urine color, and whether new spots appear on the belly, gums, or ears.

Do not give aspirin, ibuprofen, naproxen, or other human medications unless your vet specifically tells you to. These can worsen bleeding or cause stomach bleeding in dogs. If your dog is on prescribed medication, give it exactly as directed and do not stop early unless your vet advises it. Dogs being treated for clotting problems often need repeat blood work to confirm that platelet counts, red blood cells, or clotting times are improving.

Call your vet right away if bruising spreads, your dog seems weak, breathing becomes fast or labored, the belly looks enlarged, or you see blood in vomit, stool, urine, or from the nose or mouth. If your dog may have eaten rat poison, contact your vet or a pet poison service immediately rather than waiting for symptoms. Early treatment can make a major difference.