A blight for sore eyes

One of my two-year-old guinea pigs had a squint in his right eye and it looked red.

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My vet diagnosed a corneal ulcer and we are treating this with eye drops. Are corneal ulcers common? How do they develop?Corneal ulcers are common in guinea pigs. Until recently it was not possible to be very precise, but the Royal Veterinary College in London has access to thousands of clinical records of companion animals via its VetCompass Project.