Like a dog carriers you may see this in the mountain in winter, when we have snow. The transport in this place is very hard, you must have winter car, which is put it on dogs, and the best number of dogs are six or eight dogs. They may transport food, peoples and all necessary things. The control of bicycle dog carriers is from one men, and he must to be prepared in all situations, he must to know when he have to feed the dogs, when to stay and rest dogs, to prevent situation to die some dog. To see when some dog is illness.