Why dogs should never meet face-to-face on leash, according to an expert

Two dogs on leash greeting each other in the street.

Do you let your canine companion greet other dogs when they're on-leash? If so, one expert trainer says you could unknowingly be setting the stage for trouble. 

Even the friendliest of dogs who normally wouldn't hurt a fly when happily playing with the best puppy toys, can start growling, lunging, or even fighting when a greeting with another dog is set up incorrectly.