Petechiae in Dogs: Causes, Symptoms and When to See a Vet

Petechiae in dogs are tiny red or purple spots, about the size of a pinhead, appearing on the skin or mucous membranes such as the inside of the eyelids. Unlike uniform bruising, petechiae spots are small bleedings from tiny blood vessels under the skin, creating a distinctive spotted pattern. These spots are usually smaller than 3mm and do not lose colour when pressured, differentiating them from typical rashes.

While these spots may seem minor and easy to overlook, petechiae are a sign of underlying blood vessel damage and can point to potentially serious health issues. Prompt veterinary assessment is crucial to understand and address the cause. In this guide, we'll explore common causes of petechiae in dogs, associated symptoms, and why immediate veterinary care is important.

1. Injury or Trauma

Petechiae can develop following an injury or physical impact, such as a fall or bump. Often, these spots do not appear immediately but may emerge several hours later or overnight. Even if you haven't witnessed the injury, noticing these spots should prompt consideration of an unseen trauma.

2. Clotting Disorders

Clotting disorders affect the blood’s ability to clot properly, often due to low platelet counts or platelet dysfunction. Causes include conditions like haemophilia, Von Willebrand’s disease, and thrombocytopenia. Without functional clotting, bleeding occurs beneath the skin, producing petechiae. Platelets are critical to sealing injuries, so if the immune system destroys them or they are deficient, petechiae can be a primary sign.

3. Poisoning by Anticoagulants

Certain toxic substances, such as rodenticides (rat or mouse poisons), contain anticoagulants that impair the blood’s clotting ability. If your dog has ingested a poison directly or ate an affected rodent, symptoms like petechiae often develop early. Other signs include pale gums, weakness, bleeding from body openings, or blood in urine or stools. This is a veterinary emergency requiring swift treatment.

4. Immune System Disorders

Autoimmune diseases can cause the dog’s immune system to attack its own cells, including platelets responsible for clotting. This can lead to a shortage of platelets, known as autoimmune thrombocytopenia, with petechiae being a frequent early indicator. Diagnosis often involves blood tests and a thorough vet examination. Prompt treatment can prevent severe complications.

5. Heat Stroke

Heat stroke is a life-threatening condition when dogs overheat and cannot cool down effectively. One characteristic symptom is very dark red gums, frequently accompanied by petechiae on gums, eyelids or skin. High activity in hot weather increases risks. Immediate cooling and emergency veterinary attention are essential once petechiae appear to prevent serious outcomes.

6. Infections Causing Low Platelets

Certain infections, such as tick-borne diseases (e.g., Ehrlichiosis, Anaplasmosis), can cause a drop in platelet numbers or function. This weakening leads to increased bleeding risk and appearance of petechiae. These infections require rapid veterinary diagnosis and targeted treatment to restore health.

7. Miscellaneous Causes

Other less common causes of petechiae include severe allergic reactions, certain cancers, or medication side effects. Given the variety of possible underlying conditions, it is imperative to have a veterinary assessment for accurate diagnosis and treatment.

When to Contact Your Vet

If you notice petechiae on your dog, especially if accompanied by other symptoms such as lethargy, bleeding from the nose or gums, pale mucous membranes, or behavioural changes, contact your vet immediately. Early veterinary intervention improves outcomes and can be lifesaving.

Remember that responsible dog ownership involves regular vet check-ups and being alert to subtle signs like petechiae, which might signal serious health issues. Never dismiss petechiae as minor without professional advice.

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