What characteristic is true about a dog's planum nasale?

The planum nasale, or the nasal planum, of dogs is the hairless region on the surface of the nose. A distinctive feature of this area is that the epidermis lacks the stratum lucidum and stratum granulosum layers, which are typically found in the skin of other parts of the body. This absence contributes to the unique texture and function of the dog’s nose, allowing for better sensory perception and moisture retention.

The lack of these layers indicates that the planum nasale has adaptations suited to its role, such as facilitating olfactory function. In contrast, the presence of a stratum corneum would mean a thicker keratinized layer that is not characteristic of this specific area, as it usually has a smoother surface. Understanding the structure of the planum nasale helps explain its function in dogs, particularly in scent detection and environmental interaction.