Common names or abbreviations:
Description or definition:
An undershot bite, or “prognathism,”
occurs when the lower jaw extends beyond the upper. This
may happen because the lower jaw has grown too long or the upper jaw is
too short. In most breeds, including the Shiloh Shepherd, an
undershot bite is considered a fault. However, a few breeds such as
the Boxer and Bulldog have naturally undershot jaws.
With slightly undershot bites, the
incisors may be the only teeth affected. In extreme cases, the
difference in jaw length can result in problems eating, teeth that cannot
be used, teeth that interfere with each other, improper wear, and damage
to the soft tissues of the opposite jaw by the canines.
Undershot bites tend to run in
families and the mode of inheritance is likely
to be polygenic. There is some speculation
that selecting for shortened muzzles can lead to undershot bites.
dogs should receive routine dental care to prevent tooth decay and check
for excess wear. Treatment for an undershot bite is generally not
needed except in the most extreme of cases.
Links to sites about this disease:
This summary provided by:
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All rights reserved. Revised: January 2008
The information on this website was written by ISSR breeders and other
concerned individuals, however we are are NOT veterinarians. This
information is being provided as a general overview, from information we
were able to find about each disease through our own research. These
summaries are not intended to be relied upon as medical or veterinary
advice, nor do we consider ourselves experts in the veterinary field or in
any of these conditions. While we do our best to provide the most up to
date information, new research is constantly being done on these diseases.
We recommend that you do further study and talk to your veterinarian on
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posted here is the most current information available. This site was
originally designed and maintained by Debbie Knatz.