Glaucoma causes intense eye pain and vision loss in dogs. Emergency treatment and long-term management prevent unnecessary suffering in this serious but manageable condition.
Acute glaucoma is one of veterinary medicine's most painful conditions. Intraocular pressure above 40-50 mmHg (normal 15-25 mmHg) causes excruciating pain — the equivalent of severe migraine combined with extreme ocular pressure. Affected dogs blepharospasm intensely, are light-sensitive, rub their eyes, and show systemic signs of pain including lethargy and anorexia. Every minute of delay in treatment causes additional optic nerve damage and reduces the probability of vision preservation.
Emergency treatment with intravenous mannitol reduces IOP within 30-60 minutes. Concurrent topical IOP-lowering medications maintain pressure control. Pain management with appropriate analgesia is welfare-critical — glaucoma pain should not be undertreated while attempting to preserve vision. In eyes that have lost vision to uncontrolled glaucoma, enucleation eliminates the ongoing pain source and is the most welfare-positive decision.