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Tick Paralysis in Dogs

Reviewed by Dr. Melissa Beall, DVM, PhD on Wednesday, March 11, 2015
Posted April 09, 2014 in Dog Diseases & Conditions A-Z

What in the world is tick paralysis? It sounds like a disease that leaves ticks paralyzed; unfortunately, that’s not the case. Tick paralysis is a rare but serious condition caused by ticks. In North America, dogs are typically affected. Tick paralysis can also afflict people—especially children. 

What is tick paralysis?
Tick paralysis is caused by a neurotoxin produced in the salivary gland of female ticks. The neurotoxin is released into the host’s bloodstream while the tick is attached and feeding on the host. It produces ascending paralysis that begins with the lower extremities and spreads to the upper extremities. Tick paralysis can be fatal if it involves the diaphragm—causing respiratory arrest. According to the American Lyme Disease Foundation, the following ticks are capable of causing tick paralysis:

  • Rocky Mountain wood tick
  • American dog tick
  • Deer tick
  • Lone Star tick

Most cases occur when ticks emerge from hibernation between April and June.

Tick and DogSigns and symptoms of tick paralysis
Dogs usually develop symptoms within 2-7 days of being inoculated by a tick. Since tick paralysis causes an ascending paralysis, the rear limbs are initially affected. At first the animal may appear weak or unsteady because their rear limbs are weakened. The symptoms quickly progress to paralysis (inability to move) and the involvement spreads to the trunk, upper extremities, and head. Animals can die of respiratory arrest if the diaphragm becomes involved.

Diagnosis of tick paralysis
The diagnosis of tick paralysis is made if the animal shows the symptoms and an attached tick is found. Your veterinarian will perform a thorough examination since ticks can hide in your pet’s coat.

Treatment of tick paralysis
Since the paralysis is caused by the release of the neurotoxin from the tick, the primary treatment is to promptly remove the tick. Removal can be done mechanically by pulling off the tick with forceps or using a topical insecticide to kill the tick. Once the tick is removed most animals begin to recover their muscle strength within hours—followed by complete resolution within 3 days. If an animal is suffering from respiratory distress, supportive measures such as supplemental oxygen and mechanical ventilation are necessary until the effects of the neurotoxin fades.

Prevention of tick paralysis
While it's rare, tick paralysis can be a deadly condition. The best way to prevent tick paralysis is to take preventative actions. If you live in an endemic area for ticks, be

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Ruth has more than 15 years of experience in the veterinary industry as a companion animal veterinarian in private practice. Along with being a writer and media personality, she is also a founding member of IDEXX’s Pet Health Network team.