When I had to get so many dogs on a mill, in various learning phases, it was best to use some restraints and tons of rewards. Always short and sweet sessions and I attempted to never stop a session while a dog was freaking out. Meaning if they slipped and skidded or lost footing and panicked my goal was always to jackpot rewards and get them back on track before we stopped. I found ending on a freak out was always discouraging for the next session but after they learned how to overcome it a time or two with help they gained so much confidence they didn't need me in the future.
I usually started with a goal of 2 minutes, then 5, then 10, then 15, then 20, then 30. I almost never asked a clients dog to go longer than 30 at a time. It would be 30 then rest and 30 on.
With my dogs I keep a loose rule about the same except with Backup, he's by far a distance running compared to most so we got longer but steadier with him where Sloan gets short with bursting sprints at 6 mph and then back down to 3 for a few minutes before her next bursting sprint. She could do longer, she's off and bouncing around usually, but I haven't found a good medium between two of the preprogramed 30 minutes and one, unless I sit there and change the speed myself but honestly the treadmill is often used to get her out of my hair so I'll toss her on and go do dishes or fold laundry.
I usually started with a goal of 2 minutes, then 5, then 10, then 15, then 20, then 30. I almost never asked a clients dog to go longer than 30 at a time. It would be 30 then rest and 30 on.
With my dogs I keep a loose rule about the same except with Backup, he's by far a distance running compared to most so we got longer but steadier with him where Sloan gets short with bursting sprints at 6 mph and then back down to 3 for a few minutes before her next bursting sprint. She could do longer, she's off and bouncing around usually, but I haven't found a good medium between two of the preprogramed 30 minutes and one, unless I sit there and change the speed myself but honestly the treadmill is often used to get her out of my hair so I'll toss her on and go do dishes or fold laundry.