Hundreds. Literally hundreds.
One of the most common errors I see with clients is rushing through the foundations of training and trying to get the dog to obey in a much more complicated environment. In order to have a dog listen very well in places with lots of distractions (often out on a walk) the dog must master understanding the commands perfectly in places with low distractions. I like to use the analogy of a video game with my clients. In order to get to level 10, which is a walk around the neighborhood with all the dogs, scooters, people etc., you need to first conquer levels 1-9, each one becoming more and more distracting. If the dog doesn’t understand the command in your house, they can never understand it outside. If they cannot understand it outside, they’ll never obey at rush hour when the neighborhood is full of commotion.
It’s never too late in your training to go back to basics and refresh your dog on the foundations of a command that they may already know. Don’t be intimidated to go back a few steps, dust off the cobwebs, and prepare your dog for the warm weather months that come with lots of distractions!