A harness suitable for comfortably securing a diaper to a four-legged pet, such as a dog or cat. The harness includes first and second strap members, each having first and second ends. The first and second strap members form a first intersection located in proximity to the first ends of the first and second strap members, and a second intersection located in closer proximity to the second ends of the first and second strap members than the first intersection. The first strap member defines a loop between the first and second intersections that is sized and configured to cross the chest of an animal. The first and second ends of the first strap member are equipped with features for securing a diaper to the first strap member. The second strap member is equipped with features for forming an adjustable loop with the second strap member.