Dog Squinting and Shaking: What These Signs May Mean | PawAI Lab
When a dog squints and shakes simultaneously, pet owners are right to be concerned. These two signs appearing together can be associated with several underlying conditions that may range from mild irritation to more serious medical issues.
Quick Answer
Squinting paired with shaking in dogs may signal ocular pain, an injury to the eye, a foreign body, or systemic discomfort such as fever or neurological changes. The combination of these signs warrants close observation and, in many cases, a prompt veterinary evaluation to determine the underlying cause.
SYMPTOM TRIAGE Not sure how serious your dog's symptoms are? Use our Symptom Triage Tool to get a structured assessment and guidance on next steps.
What Squinting and Shaking May Look Like
Squinting, also referred to as blepharospasm in clinical terms, is the involuntary narrowing or partial closing of one or both eyelids. When a dog squints, it may appear as though they are trying to protect the eye from light, wind, or perceived discomfort. Some dogs will also paw at the affected eye or rub their face against furniture or the ground.
Shaking in this context can take several forms. Your dog may exhibit generalized body tremors, a localized head tremor, or involuntary muscle twitching. In some cases, the shaking may be subtle, such as a fine vibration of the facial muscles near the affected eye. In other cases, it may involve the entire body, particularly if the dog is experiencing systemic pain or a fever.
When these two signs occur together, it suggests that the dog is experiencing both localized discomfort around the eye and a broader physiological response to that discomfort or to an underlying condition. The shaking may be a pain response, a stress response, or a sign of something affecting the nervous system directly.
It is worth noting the difference between voluntary behaviors and involuntary signs. Some dogs may squint in bright sunlight as a normal reaction. Similarly, small breeds may shake as a baseline behavior. However, when squinting and shaking are new, persistent, or occur together in a pattern that is unusual for your individual dog, they should be taken seriously.
Possible Causes Associated With Squinting and Shaking
Several categories of conditions may be associated with the simultaneous appearance of squinting and shaking in dogs.
Eye injuries and foreign bodies. One of the most common causes is a scratch on the cornea, known as a corneal ulcer or abrasion. A foreign body such as a grass seed, debris, or a small insect may become lodged in or near the eye, causing acute discomfort. The squinting is a protective reflex, while the shaking can be a pain or stress response.
Eye infections. Conditions such as conjunctivitis, keratitis, or uveitis can cause significant ocular inflammation and pain. Bacterial, viral, or fungal agents may be involved. Glaucoma, a condition involving elevated pressure within the eye, is another potential cause that can produce both squinting and shaking due to intense pain.
Neurological conditions. Some neurological disorders may affect both the muscles controlling the eyelids and other parts of the body. Distemper, granulomatous meningoencephalitis, or other inflammatory or infectious conditions affecting the nervous system can present with ocular signs alongside tremors or shaking.
Systemic illness and pain. A dog that is systemically unwell, for example with a fever, toxicity, or metabolic disturbance, may shake as a general symptom of illness while also squinting due to generalized malaise or a secondary eye issue. Pain originating from elsewhere in the body, such as an ear infection or dental disease, may also cause both signs.
Toxin exposure. Ingestion of certain toxic substances can cause neurological signs including tremors, and some toxins may also cause ocular irritation or changes in pupil size and eye function.
What to Monitor at Home
While you are assessing the situation, there are several things you can observe and document before contacting your veterinarian.
Duration and frequency. Note when the squinting and shaking began and whether they are constant or intermittent. Track whether the signs are worsening, improving, or remaining stable over time. Even a rough timeline can be valuable information for your veterinarian.
One eye or both. Determine whether the squinting affects one eye (unilateral) or both eyes (bilateral). Unilateral squinting is more commonly associated with a localized issue such as a scratch or foreign body, while bilateral squinting may point to a systemic cause, allergy, or condition affecting both eyes.
Additional signs. Look for other symptoms that may accompany the squinting and shaking. These can include redness or swelling of the eye or eyelids, discharge (clear, yellow, or green), pawing at the face, excessive tearing, sensitivity to light, changes in appetite, lethargy, vomiting, diarrhea, or changes in behavior such as hiding or aggression when touched near the face.
Environment and recent events. Consider whether your dog has recently been in an environment where foreign bodies could have entered the eye, such as tall grass, wooded areas, or dusty conditions. Think about whether your dog may have had access to household chemicals, toxic plants, or unfamiliar foods.
Document everything you observe. Written notes, photographs of the eye (taken gently, without flash), and a timeline of events can all assist your veterinarian in forming a more accurate assessment.
What to Do While Waiting for Veterinary Advice
If the squinting and shaking are persistent and you are unable to see a veterinarian immediately, there are a few general precautions to follow.
Avoid touching or manipulating the affected eye, as this can cause further irritation or injury, particularly if a corneal ulcer is present. Do not attempt to flush the eye with any solution unless specifically instructed to do so by a veterinary professional, as some substances can worsen certain types of injury.
Prevent your dog from rubbing or scratching at the eye. An Elizabethan collar (commonly called a cone) can be useful if the dog is attempting to paw at the face or rub the eye against surfaces. Keep your dog in a calm, dimly lit environment, as bright light may exacerbate squinting associated with eye pain.
Refrain from administering any human eye drops, pain medications, or home remedies without veterinary guidance. Many over-the-counter products are not safe for dogs and can complicate diagnosis or worsen the condition.
When to Contact a Veterinarian
Contact a veterinarian promptly if the squinting and shaking persist for more than a few hours, if the squinting is severe or involves a visibly swollen or bleeding eye, if your dog appears to be in significant pain, or if additional signs such as vomiting, lethargy, loss of balance, or seizures develop.
Seek emergency veterinary care immediately if your dog is unable to open the eye at all, if there is visible trauma to the eye or surrounding area, if the eye appears to be protruding from its socket, if there is sudden blindness or a sudden change in pupil size, or if shaking progresses to seizures or collapse.
Early evaluation is particularly important for eye conditions, as delays in treatment can lead to complications including permanent vision loss, especially in cases involving glaucoma, deep corneal ulcers, or severe infections.
Frequently Asked Questions
Can allergies cause my dog to squint and shake?
Allergies, particularly environmental allergies, can cause ocular irritation and squinting. Shaking secondary to allergies is less common but may occur in response to generalized discomfort or pruritus. If allergies are suspected, your veterinarian can help identify triggers and recommend an appropriate management plan.
My dog is squinting and shaking after being outside. What could have happened?
Your dog may have encountered a foreign body such as a grass seed, foxtail, or small debris that has become lodged in or near the eye. Exposure to environmental irritants, allergens, or insects may also be involved. A veterinary examination is recommended to rule out a foreign body or injury, particularly if the signs persist.
Is squinting and shaking in puppies different from adult dogs?
Puppies may be more susceptible to certain conditions such as congenital eye abnormalities or infectious diseases like canine distemper, which can cause both neurological signs and ocular symptoms. The evaluation approach may differ, so it is important to consult a veterinarian promptly regardless of the dog's age.
Can I use human eye drops on my dog for squinting?
Human eye drops should not be used on dogs unless specifically recommended by a veterinarian. Some ingredients in human eye products can be toxic or irritating to canine eyes and may interfere with your veterinarian's ability to diagnose the underlying condition.
SYMPTOM TRIAGE Concerned about your dog's squinting and shaking? Our Symptom Triage Tool can help you assess the urgency and determine appropriate next steps.
Sources
- American Veterinary Medical Association (AVMA) -- ocular health guidelines
- American College of Veterinary Ophthalmologists (ACVO) -- corneal ulcer and glaucoma resources
- Royal College of Veterinary Surgeons (RCVS) -- guidance on veterinary eye emergencies
- Veterinary Information Network (VIN) -- clinical references on blepharospasm and tremors in dogs
- The Kennel Club (UK) -- eye conditions in dogs
Disclaimer: This article is for informational purposes only and does not constitute veterinary advice. The information presented here is not intended to diagnose, treat, or cure any condition. If your dog is exhibiting signs of illness or discomfort, consult a licensed veterinarian for a professional evaluation and treatment plan. PawAI Lab is not responsible for any decisions made based on the content of this article.