I need some advise. The cheapskate in me ran across some boots on clearence at SEARS that if you add them to your cart it takes 1/2 off. They are not waterproof, but I needed to save the $, and waterproof ones were not available in my size. I plan on wearing these in wet grass and mud when taking my dog to tracking training. Is there anything I can put on them to waterproof them without ruining the leather? Thanks for your help!