I have always let my dogs dictate where they want to go for their walks. It is their walk after all. Since Future was my first he decided the walk route even after the others same along. To the left of our drive way is toward the nuclear site. That is long walkies off leash. To the right is a leash walk toward the road and is shorter. Without exception Future alternated the route every day. Short one day, long the next. If we walked twice in a day which we generally did on the weekends, he would still alternate routes. That behavior always fascinated me too. I waited 11 years for it to change. Never did.