By certain environments, I mean those with different distractions, such as a park, a pet store, their veterinary clinic, etc.. (peachtreedogtraining.com)
We also work on creating a strong heel around a lot of different distractions. (wooftopia.ca)
The biggest struggle most of the time is getting the dogs to follow through with these commands when they are surrounded by different distractions. (jamesriverdogtraining.com)