Fig 19-01a Rabbit cranium (lateral view, right side). All photographs in this chapter are domestic rabbits (Oryctolagus cunniculus) unless otherwise indicated. Rabbits are lagomorphs and have distinctive dental patterns. The rabbit dental formula is 2/1.0/0.3/2.3/3. The rabbit upper second incisor is a small peg tooth that is located directly behind the upper first incisor. The rabbit's teeth are open-rooted and continue to grow throughout the animal's lifetime.