by keeping them fit, do you mean the right rest to graft ratio? age appropriate level of graft, not over working them, sort of close observation of the dogs daily condition after running exercise etc. Im not to sure wether to bother with the treadmill, mine get many miles a day across a variety of terrain,obviously the go up and down lan to run them behind the motor prior to the season starting, what sort of distances and speeds do you recommend? I have an idea, just wanna cross reference of you lads in the know, see if Im on the right track, mine are gonna be around 18 month by start of ne