My 11 year old female Schnauzer has recently been walking into the walls at home. Sometimes it appears she can see and others not at all. Each day seems to get a little worse. Her pupils are very large even in bright light. I took her into the vet and they ran multiple tests on her eyes and can't explain why she is acting this way. She does have the starting signs of cataracts, but the vet said it should not be enough to cause her to act this way.
Has anyone else ever experienced this and have any ideas of what could be the cause?