A black Lab is a Labrador Retriever in the breed's original and most familiar coat, not a separate breed. The earliest Labs descended from the St. John's water dogs of Newfoundland, were refined in Britain as gun dogs, and were mostly black. Most stand about 21 to 25 inches tall and weigh 55 to 80 pounds, with a broad head, an otter tail and a dense, water-resistant double coat.
Color doesn't change personality. Black Labs tend to be friendly, food-motivated and eager to please, though dogs vary, and field-bred dogs are often leaner and more driven than show-bred ones. In Waukesha, that coat handles cold, snowy months well, but it sheds heavily in spring and fall. Labs mature slowly and stay bouncy through adolescence, so consistent training and measured portions matter.