A black Lab is the Labrador Retriever in its original color, not a separate breed. The breed grew out of Newfoundland's St. John's water dogs and was refined in Britain as a gun dog, which explains the broad head, otter tail and dense, water-resistant double coat. Adults typically weigh 55 to 80 pounds and stand 21 to 25 inches tall.
Color doesn't set personality. Most Labs are friendly, food-motivated and eager to please, though field-bred dogs are often leaner and more driven than show-bred ones, and all of them mature slowly through a bouncy adolescence. In Idaho Falls, that means planning for daily exercise through a long winter, steady training, measured portions, and brushing during heavy shedding seasons, when black hair shows up on everything.