Rough And Ready Sledge Dog.

Tied, penned up or left harnessed any length of time, they assert their belief in "Liberty and Equality" by chewing their way to freedom if it takes a week to do it. As a rule, the dogs respect a female and will seldom molest her. These give birth to a litter of from 4 to 8 pups which are generally killed at birth, unless a scarcity of them, fat "puppy dog" being with the paunch of the reindeer considered a regular "Delmonico" dish. The average usefulness of their existence is about 6 to 8 years, the old dogs following the same road as fat puppies, after their usefulness has seen the limit. Fall bred dogs are best. Alaskan dogs are larger and heavier and the same rule applies to Labrador species, but as they are of mixed breed, lazier and require more food they are only used to advantage where they belong at home.

Source: Dogs Manual