Barrows Blue Ribbon Training WhistleIntroducing the Blue Ribbon Whistle: The Ultimate Dog Training Whistle. The Blue Ribbon is the most effective dog training whistle on the market, designed and manufactured by Barrows Outdoor. Extensive research shows that dogs respond best to high decibels and lower frequency sounds, and the Blue Ribbon delivers exactly that. Its engineered design ensures quick and efficient communication with your dog, no matter the conditions. Unmatched Durability