TL;DR: Dog facial paralysis causes facial drooping and an inability to blink; while not usually life-threatening, it requires veterinary care within 24-48 hours to prevent permanent eye damage.
What is dog facial paralysis and what are the common symptoms?
Facial nerve paralysis occurs when the seventh cranial nerve, which controls the muscles of facial expression, becomes damaged or inflamed. This condition is often characterized by:
- A drooping lip or a slack appearance on one or both sides of the face.
- An inability to blink the eye, leading to potential irritation.
- Causes ranging from inner ear infections and trauma to unknown (idiopathic) triggers.
Is dog facial paralysis a medical emergency and how soon should I see a vet?
The urgency level for facial paralysis is classified as Medium. While it is rarely an immediate crisis, prompt attention is necessary to manage the following:
- Seek veterinary care within 24 to 48 hours.
- Protect the eye from dryness and corneal ulcers caused by the inability to blink.
- Rule out more serious underlying neurological conditions or systemic infections.
How does taking a photo or video of my dog help with the triage process?
Providing a clear photo or video of your dog's face is incredibly helpful for veterinary triage. Visual evidence helps the medical team in several ways:
- Identifying exactly which facial muscles are affected.
- Observing secondary signs such as head tilting or abnormal eye movements.
- Determining the appropriate timeline for your pet to be examined.
- Establishing a clinical baseline to monitor for improvement or worsening over time.
Clinical Context (Merck Veterinary Manual)
Facial paralysis in dogs can manifest as unilateral or bilateral paresis or paralysis of facial muscles, leading to a drooping upper lip and drooling. Examination may reveal a slightly larger palpebral fissure on the affected side. When the eyelids or cornea are touched, the eyelids may not close, though the eyeball retracts, and corneal irritation from the inability to blink can cause excessive tear production. Trauma, rough handling, or surgery are potential causes. Idiopathic facial paralysis is common, especially in Cocker Spaniels, Pembroke Welsh Corgis, Boxers, English Setters, and domestic longhaired cats, characterized by acute onset of inability to blink and drooping ear, but with intact facial sensation. Diagnosis involves excluding other causes like ear disease, trauma, and brain-stem lesions.
Chapter: Neurology, Trauma
Source: The Merck Veterinary Manual, 11th Edition (Page 1259)