My rule of thumb is most dogs can comfortably pull about 3x their own body weight if they want to so my dogs here can pull about 600 pounds but 2 of my dogs aren’t hard pullers so their performance is a little bit limited pulling wise over a long run. And that’s why I developed DogMotoSports as I’ve always had a husky or so that’s not a hard puller while balancing that out with a husky that is as I always seem to have 1 or 2 of them:) so I had to find a way to satisfy them all and with the harder pullers they can pull the Electric DogSled On Wheels that you usually see me on and propel it as the other dogs usually just run with it but when excited they will all jet, so it’s really getting the best of all worlds for them:) thie heavier bike (EZMUSH BOARD) even when excited and all dogs engaged the weight and gearing (drag resistance of the bike) definelty will keep my 4 dog team here from propelling it and it allows me to better pace them for going up steep grades. The hard pullers will lean into this bike (their harness) and get some good resistance exercise and the other dogs are just trotting with it, but when excited will lean in and feel some of that resistance also and get some of that exercise as well! You can see all the DogMotoSports Bikes Mentioned Here By Clicking On The DogMotoSports Logo Below: