I would love a slatmill however they are in the $2,000 and up range… I use a 3G treadmill. My Labrador runs on it without a leash for 8 minutes at 3.2 MPH. The Mal runs at 4.2 MPH / 3% incline but with a leash, because he is all over the place… is lookin to the side, up , down, can’t make up his mind. I try to run them after the first morning bathroom break before breakfast. I first train them to use it as a platform for Place command. The Lab was running solo after a week.