Bitting advice from 1903 - can anyone explain it?

[stangs]

With a double bridle, the mouth-piece of the curb should be just clear of the tushes of the horse or gelding, and about one inch above the corner front teeth of the mare

- The Horsewoman by Alice Hayes

Is there some sex-linked variation in the anatomy of a horse's mouth, or is the above to do with something else entirely? (As you can tell, I know little to nothing about bitting.)

 

[Sossigpoker]

The tushes are the canines and usually only male horses have them, although occasionally mares can have them too.

 

[milliepops]

Yeah, tushes are generally found in male horses. Though one of my mares had little ones.

 

[stangs]

That makes sense, thank you both. Think I was getting wolf teeth and canines mixed up.