Don't waste your money. I put this out a while back, and although a couple of people had success with IF I had almost 100 responses telling me it does not work with Pyrs. (I put it on this list as well as a few others) Barb Bowes Bo, Molly, Chelsea (Pyrs) & Flopsy (Pyr Shep) The more people I meet, the more I like my dog! bamb@monmouth.com