What defines a flat coat in rabbits?

A flat coat in rabbits is characterized by a lack of the springiness often found in other fur types, meaning the fur lies close to the body rather than standing away from it. This is particularly true for the Rex breed, which features this unique fur texture. The flat coat is smooth and may appear short or medium in length, but its defining trait is how the hair adheres closely to the rabbit's body without the resilient, plush quality that would otherwise give it more bounce or lift.

In contrast, the other options describe fur types that do not align with the characteristics of a flat coat. Short, soft fur that is inflated suggests a different texture that emphasizes puffiness, while long, flowing hair directly contradicts the definition of a flat coat, which is inherently shorter and closer to the body. A dense and thick layering of hair also indicates a more voluminous coat rather than the smooth, compact texture that defines the flat coat.