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My dog has a white spot on his eye since birth. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Border Collie | Male | neutered | 6 years old | 39 lbs

My dig has some of his sclera going into his iris and it doesn't cause him any discomfort and it doesn't seem to affect him. He's had it since birth and I was wondering if it was anything to worry about?

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1 Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on April 29th, 2017

It's very likely Marley has what is called a coloboma. It's a genetic defect that affects dogs, mostly of the collie and herding breeds (which Marley is). In most cases it doesn't bother the dog at all, though it can cause some sensitivity to light in severe cases. If the defect hasn't changed at all since birth and Marley has normal vision, I wouldn't worry about it. However if the defect changes, the eye becomes bothersome, or you see other issues surrounding it, then it's always best to have your vet take a look.

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