02-09-2013, 08:44 AM
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The problem is that pinfiring (IMO, a barbaric practice with no therapeutic value) is used as a one size fits all response to a variety of soundness issues and lamenesses including bucked shins, splits and tendon problems.
The only way to evaluate the horse's long term soundness is with a veterinary pre purchase exam, pin firing marks aren't indicative of anything other than that the previous owner was an idiot.
As a general rule, if the pin fire marks are on the front middle of the cannons, and nice and symmetrical, they were probably done in response to bucked shins, which are purely a result of being worked too hard too young, and don't mean anything in terms of long term soundness. Other locations and patterns are more of a concern.