I have a 7 month old lab mix rescue named Tom. I am currently working with him on teaching him the boundary around my 4 acre yard. He is doing good so far, but I am worried if I take him on a walk I will ruin the progress I've made. Do you think walking him will confuse him? It's not a question of him getting exercise, as the yard is so big. I will also mention that I am a Cesar Millan fan, so answers from people familiar with his techniques would be especially appreciated.