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My Dog's Eye Is Suddenly Bulging and Red — Is It Glaucoma?

A 6-year-old Cocker Spaniel with acute unilateral buphthalmos, pain, and vision loss. Glaucoma requires prompt diagnosis and treatment to preserve vision.

8 min read2026-01-04
dog glaucomabulging eyebuphthalmosCocker Spaniel eye
PetMed AI Veterinary TeamVerified

Reviewed by Licensed DVM Professionals

Evidence-BasedPeer-Reviewed SourcesLast updated: 2026-01-04
Case Presentation

Your 6-year-old Cocker Spaniel, Bella, woke up with one eye noticeably larger and redder than the other. She's squinting, tearing, and rubbing at it. The eye looks cloudy and bulging. She seems painful. Is it glaucoma?

6 yr
Age
Cocker Spaniel
Breed
Unilateral
Presentation
> 25 mmHg
IOP (Glaucoma)

Warning: Acute glaucoma is painful and can cause permanent vision loss. Buphthalmos (enlarged globe), corneal edema, and episcleral injection are classic signs. Seek veterinary evaluation within 24 hours to preserve vision and control pain.

🩺 Diagnosis: Tonometry

Intraocular pressure (IOP) is measured with a tonometer. Normal IOP is 10–25 mmHg. Glaucoma elevates IOP due to impaired aqueous outflow. The Ophthalmology Specialist explains: Buphthalmos, corneal edema, and episcleral injection suggest glaucoma. Tonometry confirms. The Eye Diagnostics AI offers educational image analysis.

💊 Treatment

Topical prostaglandin analogs (latanoprost), carbonic anhydrase inhibitors, and beta-blockers reduce IOP. Oral carbonic anhydrase inhibitors may be added. Pain control is essential. The Pain Scale AI can help assess discomfort. Cocker Spaniels are predisposed to primary glaucoma.

Use Eye Diagnostics AI, Ophthalmology Specialist, and Pain Scale AI for education. Diagnosis requires tonometry by a veterinarian.


Key Takeaways
  • Buphthalmos + corneal edema + red eye = glaucoma until proven otherwise.
  • Tonometry confirms diagnosis—IOP > 25 mmHg.
  • Cocker Spaniels are predisposed to primary glaucoma.
  • Early treatment preserves vision and controls pain.
  • Differentials: uveitis, lens luxation, retrobulbar mass.

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