Facial Nerve Paralysis

Facial paralysis is quite common in dogs, particularly in middle to old-age. The term is simply the description of drooping of muscles in the face, which is caused, not by damage to the muscles themselves, but to the nerves supplying them.

A dog with facial paralysis has a dropped appearance to the face on one side (a bit like a person that has suffered a stroke). One ear is held lower than the other and the lip hangs down on the affected side. Affected dogs are unable to blink and have a tendency to dribble saliva and drop food from the side of the mouth. Occasionally, the same signs may be present on both sides of the face which can make the changes difficult to recognize.


What causes facial paralysis in dogs?

Sudden development of facial paralysis is a common presentation of stroke in man. However, in most cases, facial paralysis in dogs is not associated with disease of the brain, but rather with direct damage to the nerve that controls the muscles in the face (facial nerve). This nerve comes from the back of the brain to control the muscles of facial expression (ears, lips, eyelids and nostril).The most common cause of facial nerve paralysis in dogs is idiopathic facial nerve paralysis. The term idiopathic means that there is no known cause. Therefore, in idiopathic disease all the tests results will be normal. A similar condition is recognised in human medicine as Bell’s Palsy.The second most common cause of facial nerve paralysis is a deep-seated infection of the ear (otitis media/interna). In this case, other signs such as Horner’s syndrome (decreased pupil size and third eyelid coming across the eye) and/or vestibular syndrome (head tilted to one side, and balance loss) (see related fact sheet) are frequently seen in addition to facial paralysis. Rarely, facial paralysis in dogs can be associated with disease affecting multiple nerves (polyneuropathy) or brain disease (tumour, infection or inflammation). In these cases, other veterinary neurological signs are usually observed in addition to facial paralysis.



Trauma is a common cause of facial paralysis in all species. In horses, halter injuries and prolonged lateral recumbency may injure the buccal branches of the facial nerve on the side of the jaw and cause unilateral or bilateral paresis or paralysis of the lips and nostrils.
Therapy for injury may include massage and heat of denervated muscles for 15 min, 2−3 times/day, to maintain their integrity while awaiting any nerve regeneration. Laser therapy, also known as cold laser, low level light therapy, or photobiomodulation, can help nerve regeneration. The facial nerve can regenerate ~1–4 mm/day, so serial neurologic examinations can also help determine the prognosis. If there has been no improvement after 6 mo, the chance of recovery is poor. Horses with collapsing nostrils may require corrective surgery. Species that need the lips for drinking and prehending food must be given deep water containers and wet bulky mashes.

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Treatment Protocol

Treat 6 minutes session along the lower part of the cheek.

In order to reach optimal results, repeat the treatment at least twice a day.

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