My friends dog looks like the iris hasn't formed properly. I can see what I think is the very back of the eye or even his brain. I see gray with blood vessels. I watched the dog and tested to see if the affected eye could see and he can, although I have not tried from a distance.

Is this something I should be worried about? The dog is an 8 month cross bull mastiff.

  • You're definitely not seeing the dog's brain, unless it has a massive anatomical anomaly. Dogs' eyes are a bit different from ours, and the retina should be more visible than a human's retina would be. If the pupil dilates properly, and the dog can see with it, it probably isn't a big deal. If you're still concerned, see a veterinarian.
    – Wad Cheber
    Jul 17, 2015 at 2:38

1 Answer 1


I really, really, REALLY doubt that there's anything wrong here. I think you're just seeing the retina in a normal eye. If you insist on worrying, ask the vet next time you bring the dog in, but seriously, if the dog has ever seen a vet they would have noticed anything that drastic.

(A touch of congenital cataract is also possible, but since we don't have a photo we're guessing. If the vet isn't worried stop worrying. You can ask the vet at the pup's next checkup.)

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