The AKC Standard
The Neapolitan Mastiff’s movement is not flashy, but rather slow and lumbering. Normal gaits are the walk, trot, gallop, and pace. The strides are long and elastic, at the same time, powerful, characterized by a long push from the hindquarters and extension of the forelegs. Rolling motion and swaying of the body at all gaits is characteristic. Pacing in the show ring is not to be penalized. Slight paddling movement of the front feet is normal. The head is carried level with or slightly above the back.
What is not said is there should be no short strides, head bobs or any other characteristic of lameness.