What condition does "sway back" describe in a rabbit's posture?

The term "sway back" in rabbits refers specifically to a back posture characterized by a significant scoop or dip between the shoulders and hindquarters. This condition is indicative of poor body structure and can affect the overall health and appearance of the rabbit. It's often seen as an undesirable trait in show rabbits because it compromises the animal's form and may suggest underlying health issues.

In contrast, an arched back without awkward angles is considered a healthy posture, showing a well-formed spine. A straight and flat back profile is also ideal, as it implies good muscle tone and structural integrity. An upright and firm posture similarly reflects a healthy rabbit, with proper alignment of the spine. Thus, the correct choice provides a clear and accurate illustration of what "sway back" means regarding the rabbit's posture.