Company of Animals Training High Frequency Whistle for Dogs Dog Joint Health it's very important that your it's very important that your mini breed dogs and its young pups eat food that's specifically tailored to their unique nutritional requirements This all new design utilizes the same patented free falling stream of water as the original Drinkwell® which entices pets to drink more The Company of Animals High Frequency Whistle is lightweight and compact with an adjustable pitch – ideal for dog walking and training The high frequency pitch of this whistle is particularly appropriate for noise sensitive breeds such as Border Collies