(Understanding, Detecting, and Preventing This Common and Serious Disease)
Tick bite fever, also known as canine ehrlichiosis or babesiosis (depending on the specific organism involved), is one of the most common and serious tick-borne diseases affecting dogs — and occasionally cats — in South Africa. Because ticks are active year-round in many parts of the country, it’s vital for pet owners to understand how to recognize, prevent, and respond to this disease.
Cause
Tick bite fever is caused by microscopic parasites that are transmitted through the bite of infected ticks. In dogs, the most common causes are:
- Ehrlichia canis – responsible for canine ehrlichiosis, transmitted mainly by the brown kennel tick (Rhipicephalus sanguineus).
Brown Kennel Tick
- Babesia species – responsible for babesiosis (“biliary fever”), spread by the yellow dog tick (Haemaphysalis leachi).
Yellow Dog Tick
Cats are less commonly affected, but they can contract similar infections caused by Babesia felis.
Once a tick attaches and feeds, these organisms enter the bloodstream, where they infect red blood cells or white blood cells, leading to anaemia, immune system disruption, and widespread inflammation.
Symptoms
Top: Normal gum colour Middle: Very pale gums Bottom: Yellow (jaundice) gums
Tick bite fever can develop suddenly or progress gradually over several days. Early detection greatly improves the chances of recovery.
Common signs include:
- Lethargy and weakness – pets may appear tired, reluctant to play, or unwilling to exercise.
- Loss of appetite – refusal to eat or reduced interest in food.
- Fever – often high, though not always noticeable without a thermometer.
- Pale gums – due to anaemia, the gums may look whitish or light pink.
- Yellowing (jaundice) – the whites of the eyes or gums may take on a yellow tint.
- Dark or red-tinged urine – especially in babesiosis, where red blood cells are destroyed.
- Swollen lymph nodes or painful joints – sometimes seen in ehrlichiosis.
Cats may show more subtle signs, such as quietness, weight loss, or reduced grooming.
If your pet shows any of these symptoms — especially if ticks have been found recently — it’s important to seek veterinary attention immediately.
Diagnosis
Your veterinarian will perform a thorough clinical examination and may recommend tests to confirm the cause.
These can include:
Ehrlichia morula (colony) in a White Blood Cell
Babesia parasites in Red Blood Cells
- Microscopic blood smears to detect the parasites in red or white blood cells.
- Blood tests (haematology and biochemistry) to check for anaemia, organ changes, and immune response.
Accurate diagnosis is important because ehrlichiosis, babesiosis, and other tick-borne infections require different specific treatments.
Treatment
Treatment depends on the organism responsible and how advanced the disease is.
- Ehrlichiosis is typically treated with a specific antibiotic given for several weeks.
- Babesiosis is treated with specific anti-protozoal injections to kill the parasite.
In more severe cases, pets may need supportive care, such as intravenous fluids, blood transfusions, or liver support medications.
Prompt veterinary treatment is essential — with early care, most dogs and cats recover well. Delayed treatment, however, can lead to chronic illness or even be life-threatening.
Prevention
Because tick bite fever is transmitted by ticks, prevention focuses on tick control. In South Africa’s climate, year-round vigilance is necessary, but especially during the warmer summer months.
Here’s how owners can help protect their pets:
- Regular Tick Control Products:
Use vet-recommended tick preventatives consistently — these include spot-on treatments, oral tablets, or tick collars. Always follow the dosage instructions for your pet’s weight. - Routine Tick Checks:
After walks, hikes, or time outdoors, check your pet’s ears, neck, armpits, and between the toes for attached ticks. Remove any ticks promptly and safely. - Environmental Control:
Keep grass short, remove leaf litter, and treat kennels or sleeping areas with approved tick control products. - Avoid Tick-Infested Areas:
Be cautious in bushy or rural areas known for heavy tick populations, especially in warmer months.
Key Takeaway
Tick bite fever is preventable but potentially deadly if ignored. With consistent tick control, prompt veterinary attention for suspicious symptoms, and awareness of the risks, pet owners can keep their dogs and cats safe from this serious disease all year round.
