Ridecamp: [RC] Another "bone" question

At what age is a horse's bone structure done developing?  If
a 3-year old arab has cannons that are a little on the thin
side, is there a chance of them increasing in diameter by
the time the horse is 5 or 6, or are they pretty much done
by age 3?

Looking at a *really* nicely built mare, who is now 4 1/2,
but the only pics I have are of when she's three, and she
looks a little light below the hock and knee.

Just wondering...and hoping... :)

Thanks
Jennifer


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