We live in the country and walk in the fields with our old border collie and a pup, who is now a year old. Until we had our Dogtra collar, it was almost impossible to go on walks or work outside with the dogs. With the collar on, the pup responds to our calls, but most of all, he now senses where we are and stays within an appropriate distance. Even when crows, killdeer, coyotes or farm trucks pose as prey, he will recall! Thank you!!