We are true believers who have seen the difference SierraSil makes. We have always had to lift our 5 year old golden retriever’s rear in the car to travel. Two weeks on SierraSil during an outing to the vet, I opened the door and our dog Quinn jumped right in. I was shocked, happy and surprised, and had to call my wife at work to tell her. Thank you SierraSil for making this wonderful product that actually works.