Why do Rhodesian Ridgebacks have a ridge?

Why do Rhodesian Ridgebacks have a ridge?
The distinctive ridge on their back is a result of a genetic trait. It’s a strip of hair that grows in the opposite direction to the rest of their coat. This characteristic comes from a unique feature in their DNA. Historically, this ridge served a practical purpose for the breed, helping them withstand the hot African climate by providing some protection from the sun. Beyond its functional aspect, the ridge has become a defining feature of the breed, distinguishing them from other dogs.