American Kennel Club breeding standards states Pugs should have a slight undershot jaw or underbite. For reference, an undershot jaw is when the lower jaw extends out slightly more than the upper jaw, creating the classic Pug underbite look that has become popular with owners.

Is it bad if my dog has an underbite?

Upper and lower jaw and teeth alignment can be a bit tricky in dogs. As long as a dog can comfortably chew and eat solid food and their bite is functional, an underbite malocclusion can be considered both normal and healthy. ... A dog with an underbite where only the jaw is affected is a skeletal malocclusion.

Why are Underbites bad for dogs?

Malocclusions can result in an abnormal bite which can affect function and result in pain. Malocclusions predispose the patient to periodontal disease, endodontic (pulp) disease and oral trauma. Our belief at Animal Dental Care and Oral Surgery is that all pets deserve a pain-free and functional bite.