10 Reasons Why Is My Dog’s Eye Swollen? (Answered)

Your dog’s eyes are one of the first places you notice something’s wrong. So when one or both eyes look swollen, puffy, or irritated, it’s hard not to worry. Swelling around the eyes can signal everything from simple allergies to serious infections.

Sometimes the cause is obvious, like a scratch or bug bite. Other times, it could be linked to eye disease, a blocked tear duct, or even a systemic illness. The eyes are delicate—small problems can get serious fast if left untreated.

In this post, we’ll break down the 10 most common causes of swollen eyes in dogs, how to recognize symptoms, and what steps to take next. Knowing what to look for gives you the power to act early and protect your dog’s vision and comfort.

1. Conjunctivitis (Pink Eye)

• Conjunctivitis is the inflammation of the eye lining, making it look red, swollen, and sometimes goopy.
• It can be caused by allergies, viruses, bacteria, or foreign bodies.
• Dogs may squint, paw at the eye, or have yellow-green discharge.

2. Allergic Reaction

• Dogs can react to pollen, dust, insect bites, or cleaning products with eye swelling.
• Allergic swelling is often sudden, and both eyes may be itchy and watery.
• Antihistamines or avoiding the trigger can help reduce the symptoms.

3. Eye Injury or Trauma

• Scratches from rough play, sharp objects, or even branches can lead to swelling.
• You might see redness, bleeding, or your dog might refuse to open the eye.
• Injuries must be treated fast to avoid infections or permanent damage.

4. Foreign Object in the Eye

• A small seed, dust, or eyelash stuck in the eye can cause irritation and swelling.
• Dogs often rub their face, blink excessively, or tear up constantly.
• If you can’t flush it out gently, visit your vet immediately.

5. Glaucoma

• Glaucoma causes increased pressure inside the eye, leading to painful swelling and possible vision loss.
• Symptoms include a bulging eye, cloudy cornea, or lethargy.
• This is a medical emergency that requires immediate treatment.

6. Blocked Tear Ducts

• Tear ducts that don’t drain properly can cause fluid buildup and eye swelling.
• You might see wet fur, mucus, or swollen eyelids.
• Your vet may need to flush the ducts or treat for infection or blockage.

7. Abscess or Tooth Infection

• Infections near the upper teeth or jaw can spread and cause the eye to swell.
• Swelling often appears below or behind the eye, sometimes with bad breath or drooling.
• Dental infections need antibiotics or tooth extraction to resolve fully.

8. Tumors or Cysts

• Benign or cancerous growths near the eye can press on surrounding tissue and cause visible swelling.
• Tumors may grow slowly but lead to bulging, pain, or eye displacement.
• A vet may recommend imaging tests or surgery depending on the type.

9. Blepharitis (Eyelid Inflammation)

• Blepharitis is swelling of the eyelids caused by allergies, mites, infections, or autoimmune issues.
• It can cause crustiness, hair loss, and irritation around the eyes.
• Treatment may include cleansing routines, antibiotics, or anti-inflammatory meds.

10. Cherry Eye

• Cherry eye is a prolapsed gland in the third eyelid that creates a red, swollen lump.
• It’s common in certain breeds like Beagles, Bulldogs, and Cocker Spaniels.
• Often treated with surgery to reposition the gland without removing it.

Conclusion

A swollen eye is never something to ignore. While it could be caused by mild allergies or irritation, it might also be a sign of painful, urgent conditions like glaucoma or injury. The eyes are delicate—early treatment matters.

Keep an eye out for redness, discharge, blinking, or behavior changes. If swelling lasts more than a day, gets worse, or your dog seems in pain, don’t wait. See your vet and get a proper diagnosis.

By acting quickly, you can prevent small problems from turning into vision loss, infections, or lasting damage. When it comes to your dog’s eyes, better safe than sorry.

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