How are puppy and kitten mouths different from adult pet mouths?
Puppies and kittens are born with longer or “overshot” upper jaws (brachygnathism) than lower jaws. This makes it easier to nurse. As puppies and kittens age, the lower jaw (mandible) catches up to the upper jaw (maxilla). A normal adult pet mouth has jaws of equal size so that upper and lower front teeth meet in a scissors bite.