Why does my dog bark at the doorbell? Teach the bell to mean mat

Why does my dog go wild when the doorbell rings? To a dog the door is the edge of home, and every visitor who walks away looks like proof that barking works.

Pick how your dog reacts, how much time you have and what treats they like, and get a plan that teaches the bell to mean "go to your mat for a treat". Based on the PDSA, the Kennel Club and AVSAB: reward-based, no shouting or punishment, and when to ask your vet.