Heartworm medicine can cause blindness in certain bloodlines of Aussies! - we had not given our Aussies heartworm medicine and finally decided it was something we needed to do. After the normal testing they were cleared to start their medicine. Within days of starting TRIFEXIS our red Aussie became totally blind in both eyes.
We took her to the Ophthalmologist and was told certain blood lines of Aussies and Collies have a gene that lack the enzymes to be able to break down the medicine correctly, and therefore causing her blindness. My vet didn't know of this but come to find out there is a simple test they could have done to test checking for this gene prior to starting the medicine.
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