I have never tried the products, but I do remember reading lots of old, old threads regarding them. You can find some of the threads here, including comments from a company rep:
https://www.google.com/search?q=York...ial&channel=sb
You may also want to ask Gemy (Gail) about Pure Paws. I think she has used a couple of their products, unless I am confusing it with another.