What you see. The starting point for addressing any equine health related issue is your observation.


Foal or Newborn, Underbite, Lower Jaw Protrudes Forward


An underbite (also known as an undershot jaw, sow mouth, monkey mouth) is a situation in which the lower jaw (mandible) protrudes out further than the upper jaw (maxilla), causing the lower teeth to protrude forward. It may result from a congenital defect (common in miniature breeds), or from injury or trauma to the lower jaw.

If your foal has an underbite, your vet should examine them promptly. In mild cases, foals are able to nurse. In severe cases this condition could inhibit nursing. As with the opposite problem (overbite) there may be a window of opportunity early in life in which your vet may be able to help solve this problem through surgical means. As foals age, surgical options may decrease.
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    Contact Your Vet at Your Convenience for an Appointment

your role


What To Do

your vet's role

Questions Your Vet Might Ask:
  • How severe do you think the problem is?
  • Can the foal nurse?
  • Does the foal appear healthy otherwise?
  • Is the foal active and nursing?

Diagnoses Your Vet May Consider

The cause of the problem. These are conditions or ailments that are the cause of the observations you make.

Very Common
more diagnoses

Author: Doug Thal DVM Dipl. ABVP