I saw an interesting article the other day discussing a small German company that is now making contact lenes for animals, including your favorite pet! The company now has offices here in the US and is looking to promote the products. These lenes can be used on dogs, cats, horses, and even zoo animals. The company claims it helps with a variety is problems with the animals including protection from UV rays that can help horses impacted with "head shaker syndrome".
I have provided a link the the article here. It doesn't say how much something like this might cost to give good old fido his sight back!