Rider's International is made by/for Dover. Many of the Rider's International blankets come with a warranty.....any rips or tears and just send it back and they will replace it. Keep your original receipt as proof of purchase.
Last December I purchased a light weight Rider's International turnout from Dover and it has a 2 year warranty. So far it has held up very well.
Maybe you can give Dover a call and see what they say about your experience with their product.
"The best and most beautiful things in the world cannot be seen or even touched....they must be felt with the heart." - Helen Keller