Unusual Eye Movements

One eye or both eyes of the pet move or swing involuntary back and forth. Unusual eye movements in pets, medically known as nystagmus, is characterized by involuntary movements of the eye. This condition can occur in both cats and dogs and is most commonly caused by such medical issues as hypothyroidism, injuries, neoplastic tumors and thiamine deficiencies. Other things that may cause unusual eye movements in dogs and cats include viral infections, inflammation and exposure to toxins.

Unusual Eye Movements

How to Recognize

Watch to see if your pet involuntarily moves his/her eyes. One or both of your pet\\\\\\\'s eyes will usually swing back and forth. If your pet is unable to maintain focus, he may have unusual eye movements.


Unusual eye movements in pets may be caused by hypothyroidism, neoplastic tumors, viral infections, and thiamine deficiencies. Other causes include inflammation, reaction to toxins, and trauma.


Treatment varies depending on the underlying condition.

Unusual Eye Movements Affects

  • Dogs
  • Cats

Similar Symptoms

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