Dog Squinting and Not Eating: What It Could Mean

A dog that is both squinting and refusing to eat may be dealing with a condition that involves pain, nausea, or systemic illness. While each sign on its own can sometimes be attributed to a minor issue, the combination of squinting with loss of appetite warrants closer attention, as it may reflect something that requires veterinary assessment.

Quick Answer

Dog squinting and not eating at the same time may be associated with oral or dental pain, eye conditions causing significant discomfort, gastrointestinal illness, systemic infections, or toxin exposure. Because a dog that refuses food for more than a day can become vulnerable to dehydration and further complications, veterinary consultation is recommended to determine the underlying cause.

SYMPTOM TRIAGE Not sure how serious your dog's symptom is? Use our Symptom Triage Tool to get a structured assessment and guidance on next steps.

What Squinting and Loss of Appetite Together Can Look Like

The presentation of these two signs can differ depending on the cause. Some dogs may squint in one eye and simply turn away from their food bowl without attempting to eat. Others may approach the food, sniff it, and then walk away, which can indicate nausea rather than a lack of hunger. Some dogs may drool excessively or paw at their mouth in addition to squinting, suggesting oral discomfort.

It is important to distinguish between a dog that is not eating its regular food but will accept treats or table scraps, and a dog that refuses all food entirely. A dog that selectively refuses its usual diet may be experiencing nausea or a food aversion, while complete refusal to eat any food is more concerning and may indicate significant pain or illness.

Also note whether the squinting is accompanied by other visible changes around the eye, such as redness, swelling, discharge, or cloudiness. Observing whether the dog shows interest in drinking water is also relevant, as continued water intake while refusing food may suggest a less acute situation than refusal of both food and water.

Possible Causes of Squinting with Loss of Appetite

Oral and Dental Pain

One of the most common reasons a dog may both squint and refuse food is oral pain. Dogs with painful conditions in the mouth often squint or display facial tension as a pain response, while the discomfort of chewing or the anticipation of pain leads to food refusal.

Tooth root abscess: An infected tooth root can cause severe localised pain, facial swelling beneath the eye, squinting on the affected side, and reluctance to eat, especially hard foods.
Periodontal disease: Advanced gum disease can cause chronic oral pain, inflamed or bleeding gums, and reduced appetite. Dogs may still eat soft foods but avoid harder kibble or treats.
Oral foreign body: A piece of bone, stick, or other material lodged in the gums, roof of the mouth, or between teeth can cause intense pain, drooling, pawing at the mouth, squinting, and complete food refusal.
Stomatitis or gingivitis: Inflammation of the soft tissues in the mouth can cause widespread oral discomfort and reluctance to eat.

Eye Conditions with Pain

Painful eye conditions can reduce a dog's appetite in several ways. Severe discomfort may cause nausea, anxiety, or a general sense of being unwell that suppresses appetite.

Corneal ulcers: Painful abrasions or ulcers on the surface of the eye can cause squinting, excessive tearing, and a reluctance to eat due to associated discomfort and stress.
Glaucoma: This condition, characterised by increased pressure within the eye, is considered one of the most painful eye conditions in dogs. The intensity of pain can cause nausea and significant appetite loss alongside squinting, redness, and a cloudy or enlarged eye.
Uveitis: Inflammation within the eye can cause squinting, light sensitivity, and pain that may be severe enough to affect the dog's desire to eat.

Gastrointestinal Conditions

Gastrointestinal illness is a frequent cause of appetite loss in dogs. When accompanied by squinting, it may suggest abdominal pain that is causing both nausea and facial tension.

Gastroenteritis: Inflammation of the stomach and intestines can cause nausea, vomiting, diarrhoea, and loss of appetite. Squinting may be a secondary sign of abdominal discomfort.
Pancreatitis: Inflammation of the pancreas is known for causing severe abdominal pain, which can manifest as squinting, a hunched posture, and complete refusal to eat. Vomiting and diarrhoea are also common.
Intestinal obstruction: A swallowed foreign object that blocks the intestine can cause vomiting, abdominal pain, squinting, and food refusal. This is a potentially life-threatening emergency that may require surgery.

Toxin Exposure

Ingestion of toxic substances is a serious concern when a dog is both squinting and refusing food. Many toxins cause gastrointestinal signs (nausea, vomiting, loss of appetite) alongside neurological or ocular signs (squinting, pupil changes, disorientation). Common toxins include household chemicals, human medications (ibuprofen, acetaminophen, antidepressants), toxic foods (chocolate, grapes, xylitol, onions), and certain plants.

If toxin exposure is suspected, contact a veterinarian or a pet poison helpline such as the ASPCA Animal Poison Control Center or the Pet Poison Helpline immediately.

Systemic Infections

Systemic infections can produce both eye signs and appetite loss as part of a broader illness picture.

Tick-borne diseases: Ehrlichiosis, anaplasmosis, and Rocky Mountain spotted fever can cause ocular inflammation, squinting, fever, lethargy, joint pain, and loss of appetite.
Canine distemper: This viral illness can cause conjunctivitis and discharge from the eyes alongside fever, lethargy, nasal discharge, and refusal to eat.
Systemic bacterial infections: Septicemia or other widespread bacterial infections can cause ocular signs, fever, profound lethargy, and complete loss of appetite.

Post-Surgical or Medication Effects

Dogs recovering from surgery, particularly procedures involving the eyes, mouth, or head, may squint due to surgical site discomfort and refuse food due to post-operative nausea or medication side effects. If your dog has recently undergone surgery or started a new medication, contact your veterinarian to discuss whether the signs are expected.

What to Monitor

If your dog is squinting and not eating, document the following details:

Food refusal specifics: Is the dog refusing all food, or only certain types? Will they eat treats, soft food, or cooked chicken? How long has the refusal lasted?
Water intake: Is the dog still drinking water? Dehydration can develop quickly if a dog is not eating and also not drinking.
Squinting details: Which eye or eyes, constant or intermittent, and whether there are visible changes such as redness, swelling, discharge, or cloudiness
Oral signs: Drooling, pawing at the mouth, bad breath, visible swelling around the face or jaw, bleeding from the mouth
Vomiting and diarrhoea: Note the frequency, colour, and consistency of any vomit or stool changes
Timeline: When did each sign begin? Did the squinting or the appetite loss appear first?
Additional signs: Lethargy, fever, weight loss, nasal discharge, coughing, behavioural changes

Photographing the affected eye or eyes and any visible facial swelling can provide useful documentation for your veterinarian.

What You Can Do at Home

While scheduling a veterinary appointment, consider the following steps:

Offer palatable alternatives: Try offering small amounts of boiled chicken (no seasoning), plain rice, or a low-sodium chicken broth to encourage eating. Warming the food slightly can make it more appealing by enhancing the aroma.
Encourage hydration: Ensure clean, fresh water is always available. If your dog is not drinking, ice chips or water with a small amount of broth may help maintain hydration.
Check the mouth gently: If your dog will allow it, gently lift the lips and look for signs of swelling, bleeding, foreign objects, or obviously damaged teeth. Do not force the mouth open if the dog resists.
Do not self-medicate: Avoid giving human pain medications, anti-nausea drugs, or eye drops unless specifically instructed by a veterinarian. Many human medications are toxic to dogs.
Monitor for dehydration: Check for dry gums, skin tenting (gently pulling up the skin over the shoulders and observing how quickly it returns to position), and reduced urination, all of which can indicate dehydration.

When to Contact a Veterinarian

You should contact a veterinarian promptly if:

Your dog has not eaten anything for more than 24 hours (or more than 12 hours for puppies, small breeds, or dogs with known health conditions)
Your dog is also not drinking water or is showing signs of dehydration
The squinting is persistent, severe, or accompanied by visible eye changes such as redness, swelling, or cloudiness
There is vomiting, diarrhoea, or abdominal distension
You suspect toxin exposure
Your dog appears to be in significant pain, with signs such as restlessness, panting, a hunched posture, or vocalisation
There is facial swelling, which may indicate a tooth root abscess or other infection
Your dog is also lethargic, weak, or unresponsive

Complete food refusal for more than 24 to 48 hours in an adult dog, or more than 12 hours in a puppy or toy breed, is a veterinary concern even without other signs. When combined with squinting, it warrants prompt assessment.

Frequently Asked Questions

Can a tooth problem cause a dog to squint?

Yes. A tooth root abscess or other severe dental condition can cause pain that radiates to the area around the eye, leading to squinting on the affected side. This is particularly common with upper carnassial tooth abscesses, where the roots sit close to the eye. If your dog is squinting on one side and not eating, a dental examination is an important part of the evaluation.

My dog is squinting and not eating but still drinking water. Should I still be concerned?

Yes. While continued water intake is a positive sign, the combination of squinting and food refusal still warrants veterinary assessment. The dog may be experiencing pain, nausea, or an early-stage illness that has not yet progressed to the point of affecting water intake. Early evaluation can prevent a condition from worsening.

Can nausea cause a dog to squint?

Nausea itself does not directly cause squinting, but conditions that cause nausea (such as gastrointestinal illness, pancreatitis, or toxin exposure) may also cause abdominal pain, which can manifest as squinting or facial tension. In these cases, the squinting and appetite loss share a common underlying cause.

How long can a dog safely go without eating?

Healthy adult dogs can typically go two to three days without food without serious consequences, though this varies by breed, size, and health status. However, puppies, toy breeds, senior dogs, and dogs with pre-existing conditions are more vulnerable and can develop complications more quickly. When food refusal is accompanied by squinting, it is best not to wait and to seek veterinary advice sooner rather than later.

SYMPTOM TRIAGE Concerned about your dog's squinting or other symptoms? Try our Symptom Triage Tool to help evaluate the situation and decide on next steps.

Sources

American Veterinary Medical Association (AVMA)
American College of Veterinary Ophthalmologists (ACVO)
American Animal Hospital Association (AAHA)
Royal College of Veterinary Surgeons (RCVS)
Merck Veterinary Manual - Ophthalmology, Dental Conditions, and Gastrointestinal Disorders
American Society for the Prevention of Cruelty to Animals (ASPCA) Animal Poison Control Center
Veterinary Dental Forum (VDF)

Disclaimer: This article is for informational purposes only and does not constitute veterinary advice. If your dog is squinting and not eating, especially if the refusal persists for more than 24 hours, contact a licensed veterinarian promptly. PawAI Lab provides general education to help pet owners make informed decisions but cannot diagnose or treat medical conditions.