Why are you told not to look a gift horse in the mouth? Because a horse's teeth are a good indication
of how old it is! I'm often asked "how
long do horses live?" The answer is, "it
depends," but the average lifespan of a horse is 25-to-30 years; some horses
live into their 40s and beyond.
Teeth Tell the Story
Determining age by examining a horse's teeth is an imperfect
science; however, one can make a good guess by using the following method. An important point to remember is that tooth
wear can be sped up or slowed down depending on whether the animal lives inside
or outside, or has had proper dental care in the past. It's tough to be specific after about age 15
or so.
1. Permanent Teeth – These appear as the
animal loses its baby (also known as milk or deciduous) teeth, starting at
around age 3. The four center teeth
appear first. By age 5, a horse has most
of its permanent teeth – a "full mouth".
2. Cup Disappearance – Cups are the
indents in the center surfaces of the teeth.
They wear and become smooth as a horse ages, beginning with the lower
teeth working backward, and then beginning with upper teeth and working
backward. At age 11, they are all smooth
– a "smooth mouth".
3. Angle
of Incidence – The angle between the upper and lower teeth widens as a
horse ages. The teeth are not neatly
stacked like in a human mouth – they slant to meet one another. By age 7, the angle change can form hooks on
the backs of some of the teeth where wear is uneven.
4. Surface Shape – Teeth are wide and flat
in younger horses. Starting at around
age 8, teeth become oval-shaped. By age 15 they are triangular-shaped.
5. Galvayne's Groove – There is a groove
in the upper incisor starting at the gum, which appears at 10 years of
age. It extends halfway down the tooth
by 15 and reaches the bottom by 20 – after that, it recedes and actually
disappears by 30.
Dental Aging Factors
Horses with poor dental conformation can acquire flaws that
make them appear older. For example, a
"parrot mouth" (overbite) can hinder a horse's ability to graze and lead to
weight loss. "Cribbing" is a vice (bad
habit) where they'll chew just about anything they can get their teeth on – typically wood, which can cause early wear to
incisors, or even chip or break them.
Most horses need annual dental attention to file hooks and sharp spots
off of molars. "Floating" is the name of
this procedure, but if done incorrectly, it can also cause excessive wear.
Other Age Concerns
As a horse ages, it faces problems just like elderly
humans. Older horses are more
susceptible to disease, heat, cold, and excessive weight loss. Horse owners must be proactive about caring
for their elderly animals.
This past winter, we lost our 35 year old Quarter Horse,
Joe. He was a great companion and taught
many kids to ride. He taught me a lesson
as well – to keep the horse straight between a line of jumps, or you'll wind up
on the ground!
Joe is currently entered in a Pet of the Year contest
sponsored by a local radio station. If
you could take a minute to vote for him we would appreciate it! He is Contestant #9.
Resources:
http://en.wikipedia.org/wiki/Horse
http://horses-arizona.com/pages/articles/teeth.html
http://encarta.msn.com/media_461516414_761562654_-1_1/horse_teeth.html
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