If I could teach a dog only one thing, what would it be?
To come when called. Few things are quite as frustrating as a dog that is oblivious to your futile attempts to call him back to you or worse, a dog that thrives on the game of "keep away."
A dog with a strong recall has freedom! You can take them places and get them back when you want to leave.
A dog with a strong recall has safety! You can let them off the leash without an unreasonable fear of having them run off or get hit by a car (though all decisions involve risk).
A strong recall makes you welcome with other people and dog owners!
If you have ever found yourself calling out "don't worry; my dog is friendly!" then please read the next paragraphs with great care.
Get ready because I'm going to be blunt here….