I have not tried one designed for dogs. I have tried teaching my older dogs to use my treadmill and they flail around and panic. My puppy (9 month old husky/shepherd/golden mix) thinks it is the FUNNEST THING EVER. But everything in life is the FUNNEST THING EVER to him.
I found a new product called a licky stick or lickety stick (can't remember) it looks like a roll-on deodorant but they lick it and it has bacon or chicken flavored goo inside. Fez loooves these things so I started him out on the stopped treadmill and held the stick by his nose. I turned it on the lowest setting and he didn't really care, just walked and licked, walked and licked.
Now, I have a tough time because I use the treadmill now and he is confused as to why I am using HIS treadmill.