I know this thread is a bit old, however I have had success in training my pup to use the treadmill.
A couple of comments/tidbits I've learned.
1. I started mine off by leashing him to a table in the room, and letting him watch me walk on the treadmill. After a little while he started pulling at the leash to get to the treadmill, however I made him wait a couple of days to allow him to see me walking, jogging, hearing the buttons beep, etc. Our treadmill seems a bit loud, which is initially a deterrent.
2. Once he progressed from very slow to loping/running on the TM, we still continued to have a problem with him barking and attacking the front of the machine where the tread band comes out. Up until today, I've been giving him a tennis ball to carry in his mouth, which keeps him quite until he eventually drops it and goes back to attacking the monster inside the TM.
3. Had a stroke of common sense tonight, and decided to put a collar/leash on him. He immediately calmed down. When he started acting up, I simply pulled him off the machine and made him sit near it for a couple of minutes while it ran and ran, without him.... Seems to be working pretty good.
4. Also had a second stroke of common sense tonight. There is a reason why taking a dog on a walk can stimulate a BM. Running on the TM caused him to have one....
This time I happened to look up and seem him jogging along, only to kind of hunch over while still moving and little dark things bouncing off behind him along the TM...
Thankfully they were Grade A specimens, ripe and firm.
I had taken him out about an hour earlier to pee, and seemed distinctly uninterested in doing anything else.
On the flip side, he seems to love this thing, no treats needed!
And since I moved my work computer into the same room, I can keep an eye on him, exercise him, and do some actual work at the same time.
If you can't find the time to walk your dog every day or take him to the park several times a week, this is easily going to be the best $-$$ you can spend for your dog and probably your sanity. Check Craigslist and find someone giving one away.