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Six equine veterinarians explain what they look for
in regards to hooves and feet when making prepurchase examinations
ANY NUMBER OF health and soundness factors come into play when making
a prepurchase examination of a horse. Yet one of the more difficult areas in evaluating horses for purchase is the potential
that lameness concerns and foot problems may have on future success.
To provide ideas on evaluating the equine foot, American Farriers Journal
editors sifted through a half dozen scientific papers dealing with prepurchase examinations. The foot and leg guidelines found
here were taken from papers dealing with prepurchase examinations that were presented at several recent American Equine Practitioners
Association annual meetings.
Western Performance
Jerry Black finds it's essential to know how a horse will be used when
evaluating feet during a prepurchase examination. The equine veterinarian at the Pioneer Equine Hospital in Oakdale, Calif.,
pays close attention to the hocks and stifles while evaluating cutting and reining horses.
He says larger Quarter Horses have traditionally had a relatively high
incidence of navicular disease due to foot size, straight pastern angulation and large muscle mass. While significant strides
have been made in breeding a more modern type of Quarter Horse with better overall conformation, Black says attention must
be paid to the principles of distal limb conformation and balance.
With team roping horses, he finds added stress is placed on the distal
forelimbs while turning the steer or positioning the horse to rope the heels. The result is a relatively high incidence of
degenerative arthritis in the distal joints. Bone spavin is also a common occurrence due to body type and performance stress.
With barrel horses, he looks at foot size, conformation and balance since
concussion can be severe. Significant stress is also placed on the hindlimbs while propelling the horse around the barrel
at a high rate of speed.
Jumpers, Dressage Horses
Daniel Marks of Santa Fe, N.M., wants to know the type and quality of
shoeing a horse has previously had when examining jumper and dressage horses for possible purchase.
He says many factors must be considered with each horse before reaching
a prepurchase decision. As an example, he cites 17 relevant factors that need to be considered with a horse that has an oddly
shaped or small foot:
1. History of previous lamenesses.
2. Conformation that may relate to the foot.
3. Musculoskeletal pathology in the leg.
4. Shape and quality of the hoof.
5. Wear of the shoe or hoof.
6. Shoeing techniques that have been used.
7. Response to hoof testers and percussion.
8. The flight of the leg, foot landing and breakover.
9. Evidence of lameness.
10. Other tests such as toe elevation prior to trotting.
11. Radiographic findings.
12. The vet's knowledge as to the intended use of the horse.
13. Consideration of the buyer's circumstances.
14. Quality of the farrier, as a specialized farrier might be required
to maintain difficult feet.
15. Schooling surface.
16. Probable show schedule.
17. Show ring footing.
Marks says slight differences in size
and shape of a horse's feet are common and not necessarily abnormal. As an example, a club foot can still be functional, depending
on radiographic changes and shoeing techniques that are used.
"Foot lameness is usually more apparent in hard going and frequently
is accentuated by circling," he says. "This ranges from a minor sole bruise to irreversible navicular disease."
If a horse is shod and managed well, Marks says mild cases of navicular
disease may be tolerable for pleasure riding and easy competition. But tackling big jumps is not compatible with navicular
sensitivity.
"Dressage riding surfaces are forgiving of foot problems, but a tendency
to shorten the stride is not a good thing in a dressage horse," he says. "Corners, zigzags, extended trot and tempo changes
are movements where navicular disease may degrade performance.
"Hunters can compete with mild navicular disease, provided that the gallop
stride is naturally long and the going is forgiving."
Marks finds horses with caudal hoof pain often suffer from a laminar
tearing rather than an internal foot problem. Pedal osteitis and deep bruising may sometimes reside in the subchondral bone
of the third phalanx. Sidebone can also be a concern, as can navicular spurs caused by uneven hoof loading.
"Laminitis and founder have so many variables that each case must be
evaluated on its own merit," he says.
Marks maintains that more than 50 percent of all jumpers and Grand Prix
dressage horses have an inflammation of the distal intertarsal and tarsometatarsal joints.
"While this requires treatment for maintenance of peak performance, the
condition is usually bilateral but not symmetrical," he says. "A combination of shoeing, management and medication generally
is successful."
Sue Dyson of the Centre for Equine Studies in Kentford, England, says
the majority of elite show jumpers are naturally well-balanced, loose-moving warmbloods. Reaching the Grand Prix competition
level at 8 or 9 years of age and continuing to compete until up to 20 years of age, these horses are generally well proportioned
but vary in conformation.
"Yet the feet are a notable exception," she says. "The feet of warmblood
horses are often not well conformed nor well proportioned in size and shape relative to the horse's body weight.
"This can be regarded as a conformational fault, sometimes compounded
by poor foot trimming. Greater attention to correct foot balance may help prevent some lameness."
Eventing Horses
Dyson says horses with a predominance of Thoroughbred breeding do better
than other breeds in this combination of dressage, show jumping and cross-country work.
When it comes to examining these horses, Dyson says foot conformation,
trimming, shoeing techniques and shoe wear are critical.
Along with other common causes of acute lameness in event horses, she
finds foot soreness, binding nails, trimming and shoeing problems must be considered in evaluating the potential problems
of these horses.
Polo Ponies
Paul Wollenman of the Palm Beach Equine Clinic in Wellington, Fla., likes
a big cupped hoof with a short toe and good heel in polo ponies.
"Over the past 5 years, less chronic heel pain has occurred in polo ponies
due to farriers paying special attention to toe length, breakover and hoof growth," he says.
When examining horses with underrun heels, different sized feet or lameness
concerns that show during an examination, he definitely wants to see radiographs.
Distance Horses
When evaluating horses for competitive trail riding, endurance riding
or marathon driving, Matthew Mackay-Smith suggests paying close attention to the feet.
The White Post, Va., equine veterinarian and member of the American Farriers
Journal International Equine Veterinarian Hall of Fame, says mismatched hooves can be a serious concern with endurance type
horses.
In evaluating soundness, he expects to find good feet with thick, tough,
flinty hoof walls. There should be a moderate slope to the hoof with deep open hooves that give the impression of an oversized
foot with matching hooves.
Gaited Horses
Hugh Behling says American Saddlebreds aren't susceptible to greatly
increased incidences of lamenesses. This is due to the elevated and shortened stride length or lack of extension on the anterior
phase of the foot flight pattern.
When making prepurchase examinations, the Simpsonville, Ky., equine veterinarian
finds contracted heels, sheared heels, quarter cracks and hoof wall separation are typical foot concerns.
Except for pleasure classes, he says there are no restrictions on using
pads, double-nailing techniques, lead weighting, clips or bands on shoes. It's also common to find large hoof wall defects
filled with acrylics.
"The incidence of lamenesses due to diagnosed navicular pain is similar
to that in the Thoroughbred population," he says. "There are bloodlines that seem to have a high incidence for one of the
forefeet having a dished foot."
He finds the proximal one-half of the hoof wall parallels the dorsal
border of the third phalanx very closely and deviates distally. This is often found with pastured horses that haven't been
shod or trained.
Behling says an understanding of shoeing methods will help veterinarians
minimize the frustration of examining Saddlebreds. |