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?
1 Answer
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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