Why do some Bulldogs have inverted tails?

Some Bulldogs have inverted tails due to a genetic trait that affects the development of their tail structure. This can result in a tail that is either very short or curled inward, which is often referred to as a "screw tail." The condition is more common in certain breeds, such as the English Bulldog, and can be associated with breeding practices that prioritize specific physical characteristics. In some cases, an inverted tail may lead to health issues, such as skin irritation or infections, due to its position.