Start with verbal commands. And ignore the adage: Old dogs can learn new tricks. By Malia Wollan “A dog whistle is an extension of your voice,” says Tom Dokken, who, along with his staff in Northfield ...

I never could whistle as a kid. It was one of my biggest disappointments. Every night when my dad got back from work, he would whistle like a little bird, announcing to us — my sister and me — that he ...