Facial Droop in Dogs

See your vet immediately if your dog develops a new facial droop. A sagging lip, droopy ear, uneven nostril, or inability to blink can happen when the facial nerve is not working normally. In dogs, this is often called facial paresis or facial paralysis. The problem may affect one side of the face or, less commonly, both sides. Pet parents may first notice drooling, food falling from the mouth, a “sleepy” eye, or a face that suddenly looks uneven.

Facial droop is a symptom, not a diagnosis. Common causes include inner or middle ear disease, idiopathic facial paralysis, trauma, hypothyroidism, and tumors affecting the ear or nerve. Some dogs also have other neurologic signs at the same time, such as head tilt, abnormal eye movements, balance problems, weakness, or changes in swallowing. Those combinations raise concern for a more serious ear or brain-related problem.

One of the biggest day-to-day risks is eye injury. Dogs that cannot blink normally may develop reduced tear production, dry eye, corneal irritation, or ulcers. Even when the underlying cause is not life-threatening, the eye still needs prompt attention. Early veterinary care helps protect the eye, identify treatable causes, and decide whether your dog needs basic outpatient care or more advanced neurologic workup.

The most common cause of a one-sided facial droop in dogs is damage or dysfunction of the facial nerve. Merck and VCA both note that middle and inner ear disease are important causes because the facial nerve runs very close to the ear structures. Dogs with chronic ear disease may develop facial droop along with pain, head tilt, balance changes, or reduced hearing. Idiopathic facial paralysis is another recognized cause. That means no clear trigger is found after your vet rules out more obvious problems. It is reported more often in older dogs, and some spaniel breeds appear overrepresented.

Other possible causes include trauma, rough injury to the head, hypothyroidism, polyneuropathy, immune-mediated disease, and tumors involving the middle ear or facial nerve. Less common but more urgent differentials include central neurologic disease, severe toxin exposure, and generalized paralysis disorders. If facial droop appears together with weakness, trouble swallowing, voice change, collapse, or breathing changes, your vet may need to look beyond the face and consider a broader neurologic emergency.

Not every uneven face is true facial nerve paralysis. Eye disease, painful oral disease, swelling, bite wounds, or severe ear pain can also make a dog hold the face differently. That is why a hands-on exam matters. Your vet will look at the eye, ear canal, mouth, and neurologic function together before deciding which causes fit best.

Any new facial droop deserves a prompt veterinary visit, ideally the same day or within 24 hours. The reason is twofold. First, some causes are time-sensitive, especially inner ear infection, trauma, toxin exposure, or neurologic disease. Second, dogs that cannot blink normally can injure the surface of the eye very quickly. If the eye looks red, dry, cloudy, squinty, or painful, do not wait.

See your vet immediately if facial droop comes with head tilt, falling, circling, repeated vomiting, abnormal eye movements, severe ear pain, trouble eating, trouble swallowing, weakness, collapse, or known toxin exposure. Those signs can point to vestibular disease, deeper ear infection, brain involvement, or a generalized neuromuscular problem. Emergency care is also important if your dog was hit by a car, had a recent bite wound, or suddenly cannot close one eye.

If your dog otherwise seems comfortable and the only sign is a mild drooping lip or ear, it may still be reasonable to schedule an urgent daytime appointment rather than an overnight ER visit. Until then, prevent rubbing at the eye and avoid giving human medications. If your dog already has prescribed eye lubricant from your vet for a similar issue, use it as directed while arranging care.

Your vet will start with a physical exam, eye exam, ear exam, and neurologic exam. They will look for whether the problem is truly weakness of the facial muscles or whether pain, swelling, or another issue is making the face look uneven. Common findings include inability to blink, drooping lip, drooping ear, reduced nostril movement, drooling, and food or water falling from the mouth. A Schirmer tear test may be used to measure tear production because reduced tears are common with facial nerve dysfunction.

From there, testing depends on the rest of your dog’s signs. Basic workup may include ear cytology, bloodwork, and thyroid testing. If your vet suspects middle or inner ear disease, they may recommend imaging of the ear region, culture, or a sedated ear exam. If there are balance changes, multiple cranial nerve deficits, or concern for a mass, advanced imaging such as CT or MRI may be recommended. In some cases, referral to a neurologist is the most efficient next step.

Idiopathic facial paralysis is usually a diagnosis of exclusion. In other words, your vet reaches that conclusion after checking for more treatable or serious causes. Recheck exams are important because nerve recovery can be slow, and the eye may need ongoing monitoring even if the facial appearance improves.

Home care depends on the cause, but eye protection is often the top priority. If your dog cannot blink normally, use only the eye products your vet recommends and give them exactly as directed. Watch for redness, squinting, cloudiness, rubbing, thick discharge, or a suddenly more closed eye. Those can signal corneal injury and should prompt a same-day call to your vet.

At home, monitor whether food or water falls from the mouth, whether drooling is getting worse, and whether your dog can chew and swallow comfortably. Softening food or offering smaller meals may help some dogs, but ask your vet before making major diet changes. Keep the ear area clean only if your vet has shown you how. Do not put over-the-counter drops into the ear or eye unless your vet says they are safe for your dog’s specific situation.

Track the rest of your dog’s neurologic signs too. A simple daily note about head tilt, balance, eye appearance, appetite, and comfort can be very helpful at rechecks. If your dog develops stumbling, repeated vomiting, worsening weakness, or breathing trouble, seek urgent care right away. Some dogs recover partially over time, while others need long-term eye support and periodic monitoring.