What Are the Causes of High WBC in Dogs?

WBCs (white blood cells) play a vital role in protecting your dog's body from infection and disease. They're produced in the bone marrow and travel throughout the bloodstream, looking for signs of trouble. When your dog's WBC count is high, it means inflammation is present in their body indicating a potential infection, injury, or other medical condition.

Here are some of the common causes of high WBC in dogs:

1. Bacterial infections: Bacterial infections, such as pneumonia and urinary tract infections, are a common cause of high WBCs in dogs. Bacteria invade the body and trigger the immune system to produce more white blood cells to fight the infection.

2. Viral infections: Viral infections, such as distemper and canine parvovirus, can also cause high WBCs in dogs. Viruses damage cells in the body, leading to inflammation and an increase in white blood cell production.

3. Parasitic infections: Parasites, such as worms and fleas, can also cause high WBCs in dogs. Parasites can cause irritation and damage to the tissues in the body, leading to inflammation and an increase in white blood cell production.

4. Allergies: Allergies to food, environmental triggers, and medications can also cause high WBCs in dogs. Allergies can lead to inflammation and an increase in white blood cell production.

5. Inflammation: Any inflammatory condition in the body, such as arthritis or inflammatory bowel disease, can cause high WBCs in dogs. Inflammation is a natural response to injury or infection, and it involves an increase in white blood cell production.

6. Cancer: Cancer can also cause high WBC in dogs. Certain types of cancer, such as leukemia, lymphoma, and mast cell tumors, can lead to an overproduction of white blood cells.

7. Stress: Stress can also cause a temporary increase in WBC in dogs. Stress can cause the release of hormones such as cortisol, which can affect the production and release of white blood cells.

8. Medications: Certain medications, such as corticosteroids, can cause high WBC in dogs. Corticosteroids can suppress the immune system, which can lead to an increase in white blood cell production.

If you notice your dog has a high WBC count, it's important to take them to the veterinarian for further evaluation. The veterinarian will perform a physical examination and may recommend additional tests to determine the underlying cause of the high WBC count.