SportDOG Brand Competition Mega Whistle | Dog Training WhistleSportDOG Brand Competition Mega Whistle Dog Training Whistle SportDOG brand whistles. The SportDOG brand Roy Gonia specialty dog whistle is handcrafted and has been used to train more field champions than any other whistle. The whistle features a lower pitched sound that travels farther and an easy to blow design for effective communication during training or on the field. The Roy Gonia Special is a great versatile dog whistle used by professionals