Why is it vital for a rabbit’s diet to include hay?

Including hay in a rabbit's diet is crucial primarily because it is essential for maintaining dental health. Rabbits have continuously growing teeth, particularly their incisors, which can lead to serious dental problems if not worn down properly. Chewing tough, fibrous materials found in hay helps to naturally grind down their teeth, preventing overgrowth and ensuring that they remain at a healthy length.

While hay does contribute to other aspects of a rabbit's health, such as providing fiber for digestion and assisting with hydration when it's fresh and unprocessed, the most significant reason for its inclusion is the prevention of dental issues. Proper dental care directly relates to the overall well-being of the rabbit, making it a fundamental component of their diet. In contrast, although hydration and protein are important for rabbits, they are neither the primary reason for hay consumption nor the role that hay primarily plays in a rabbit's health.