I'm having a hard time with one aspect of training our new pup - not to run off. We've had English Mastiffs for the past 27 years (3 different males) and they were never tied. They could be outside by themselves and never went beyound the boundary that we set for them. In fact in the nice weather the front door would be propped open all day so they could go in and out as they pleased. All we did with them as pups is take 2 daily walks around their boudary for a couple weeks and that was it. We lost our last Mastiff last June and finally decided to get another pup. Being we are getting older and kind of crippled up we decided on a smaller dog this time. A mixed Border Collie. He is now 3.5 months old. It took 10 days to get him housebroken. He listens to and obeys simple commands and seems very smart. But we have to have him tied when outside and we can't stand it! I consulted with a semi-pro dog trainer. His advise was to use a long 15' lead and walk him around with that at first. Then after 15 minutes, drop the lead. When he goes to run off, step on the lead. After a while he will learn that that 15' is his boundary when we are outside with him. We never leave him tied outside alone - if he is outside we are outside. I have ~3 acres of mowed lawn - then it is endless woods living in the middle of a 200k acre state forest. Neither of us can run anymore to chase him. One time was enough - we had a heck of a time getting him back. He thinks it is a game. The trainer thinks he may be too young yet. What happens is that he gets easily distracted - chasing bugs, birds in distance, and general exploring. A fence of any kind is not an option. I figure that if our Mastiffs can do it I should be able to train this one to do it. We feel so gulty having to tie him (20' lead) when taking him out. Any suggestions on a training procedure?