Does anyone here us a carpetmill to condition their dog? They are not available here in India and shipping them due to size and weight is out of the question, so i am trying to build one.If any member here uses one I would love to see pics/plans especially of the running surface below the the carpet. Is it just a slick smooth surface or are there rollers like a conveyor belt? I know that a slatmill uses roller blade wheels. Would appreciate any info. Regards, Yaj.