Original: Sled dogs, known also as sleightman dogs, sledge dogs, or sleddogs are types of dogs that are used to pull a wheel-less vehicle on runners (a sled or sleigh) over snow or ice, by means of harnesses and lines.
Simplified: Sled dogs, known also as sleigh dogs, sledge dogs or sleddogs are types of dogs that are used to pull a wheel-less vehicle on runners (a sled or sleigh) over snow or ice, by means of harnesses and lines.