I was reminding someone of this over the weekend. It’s important to remember, just teaching a behavior is not enough. If you want your pet to continue to have fluency with that behavior, you’ve got to continue reinforce it…to remind your pet that choice is going to be of value to him/her. It doesn’t always have to be food – there are so many ways to reinforce behavior.

To Have A Better-Behaved Dog, Consider What Happens Between Your Training Sessions
Every waking moment of every day and every interaction your dog has with you and the environment is teaching your dog what works, what matters, and what associations to have.