While the terms are sometimes used interchangeably, there is a difference:
* Hair is typically longer, straighter, and grows continuously. It is found on mammals like humans, horses, and cats.
* Fur is shorter, denser, and often has a thicker undercoat. It's common in animals like dogs, rabbits, and bears.
Bulldogs have short, dense fur that needs regular brushing to prevent mats and tangles.