This e- collar has transformed our ability to let our dog "be a dog" and run, while still keeping her focused and coming back whenever we call. We live in Spain, where we rescued a podenco in January, just under a year old. Being sight hounds they are notorious "runners" and she was no exception. She's smart and affectionate, with what we have learned is a typical podenco stubborn streak when off lead. This collar has been a huge help, and yesterday was "graduation day" at the local dog beach, where she ran....and ran....and ran....and had a glorious time, returning whenever called and still have lots of fun, including "checking in" with us regularly. She can now "be a dog" and have fun without us worrying she'll run off. Thank you for a great product! You sent