Which preposition to use with spavins

on Occurrences 2%

"Sure," he replied, taking in the horse, which besides being lame and having a glaring spavin on its off hind leg was a mere bone bag fit only for the soap factory.

as Occurrences 1%

The mule may not be so liable to spavin as the horse, but he has ringbone just the same.

in Occurrences 1%

If it is possible for a human hack-horse to have spavins in two joints in each leg, that man had them; and he looked as if he couldn't remember what it was to have a good feed.

Which preposition to use with  spavins