[FeralAhriman]

I was read somewhere that Rotts aren't really the type of dogs that actually want to wander from you. This holds true to my rott-mix. I obey leashlaw, but when my Feral family and I go play ball we let him off his leash. He pretty much always follows me around and when he does wander off I yell my recall word (which is Navajo for "let's go" =D) and he usually comes running. When he does I start walking and he runs right after me. He's at about four months, now. When we've taken him to the mountains he's been great with keeping up with us. We have to get him used to doing it near other people now, but we're enrolling him in Obedience classes really soon.

In general, though, I think the advice others have given is really good. Especially with practicing recall on the various lead lengths. But I think your rott will probably want to stay near you.