Our boy Maximus (6 years old) is obsessed with patrolling the wall between our back yard and the neighbors'. They have 2 big dogs which are very mellow but Max somehow thinks they are invading our privacy. He runs for hours back and forth and I have to command him inside and close the doggie door the other wise I guess he would run until he collapses.
I tried to break his mood with treats, walking him on a leash in the back yard and fence off the area where he usually runs but nothing helped so far.
Does anybody know how I could help him to get rid of this obsession?