well i will say this i would not put a 6 month pup on a treadmill and dont know anyone who would it is not fully developed yet so leave the mill alone and let the pup grow and mature before you do!!!!! but anyway you asked for good advice im giving it ,, anyone who has had dogs will tell you the same .
this is what i am saying i no he is to young you dont need to tell me that what i side was (what age would you start runing them at)
ok ill answer that ,,,,,,,,,,,,,,never why would i want to like most my dogs get enough exersise without a mill
MA