Its like a 7 hp dogsled team that you can ski behind.  They were phased out back in the day in favor of snowmobiles, but they are making a comeback:

“A snowdog is a type of vehicle first invented in Canada in the 1950’s. In the beginning of the 60’s Hus Ski and Bolens has been mass-produced in North America. In the 70’s snowmobiles became more popular in the USA and Canada and gradually replaced the motor towing vehicles. We believe that these vehicles have great potential and have developed our own version of this amazing vehicle.”

You can own one for $2,599. Here’s the full promo video: