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What is the best pet health insurance?

I have a 5 year old Shih Tzu who had a problem with her eye. At first the Vet said it could be from diabetes, glaucoma, cancer, etc… He mentioned specialist and test which he said is very costly. He ran test and it was an minor infection which cleared up. But if it were something worse, I’d wish I had insurance.

I have seen many online and a couple at the Vet. Can anyone recommend one and why? Thanks!!!