Companion Animals

Dog Rocky Mountain Spotted Fever

Rocky Mountain spotted fever is a severe tick-borne disease in dogs that is rapidly fatal without treatment, requiring prompt diagnosis and antibiotic therapy.

Key Facts

Rocky Mountain spotted fever (RMSF) is caused by Rickettsia rickettsii transmitted by ticks
Despite its name, it is most common in the southeastern US and parts of North and South America
RMSF causes vasculitis, fever, lethargy, limb swelling, and haemorrhagic disease
Without treatment, mortality rates can exceed 25% in dogs
Doxycycline is highly effective when started promptly, often before laboratory confirmation

Welfare Considerations

RMSF progresses rapidly and causes severe suffering through high fever, pain, swelling, and vascular damage. Neurological signs and haemorrhage cause significant distress in affected animals. The speed of deterioration means welfare depends critically on prompt recognition and treatment. Dogs in endemic areas should receive prompt empirical doxycycline treatment when RMSF is suspected without waiting for confirmatory test results.

What You Can Do

Use veterinarian-recommended tick prevention products consistently in endemic areas
Check dogs thoroughly for ticks after outdoor activities
Seek emergency veterinary care immediately if your dog shows fever or limb swelling after potential tick exposure
Never delay treatment waiting for test results if RMSF is clinically suspected
Understand which tick species in your region transmit RMSF and take appropriate precautions