Depending on what size knife your daugther wants to carry, a stockman or a good solid lockback may be best. The crosslock with the hoofpick is okay, but its pretty big, and I've found that the hoof picks on most knives like that aren't real good. A hoof pick needs to have an end at least as sharp or pointy as your average flat head screwdriver. Those big wedge shaped round things they call hoof picks make it alot more work to dig out sand thats been packed in by a thousand lbs of horse than it needs to be. At all the horse shows I go to most people either have a stockman or sometype of locking blade folder. I carry a delica and a gerber multi tool and get by around my horses fine. In a pinch when you don't have a hoof pick and need one you can use the blade of the knife to carefully clean out the hoof. I'd get a small lockback with a partially serrated blade thats takes a really good edge. I've found that the things I cut most around my horses are rope, boxes and packages,Duct tape,bungee cord,and leather. You need something that can do all that well. A one hander with some serrations is really nice to for that occasion that you need to cut the horse out of somehting. When they panic they can get wound up in things pretty good and either hurt themself even more in a struggle to get free or hurt you. I my friend had one panic inside a horse trailer on put its head through the fiber glass roof.When it came down it got all tangled up and we had to cut its halter off(double layered and stitched nylon)So a sharp knife is necessary. I'm not trying to scare you about what might happen, things like that don't happen very often and when you know what your doing and keep safety in mind, most horses are very safe to work with.But accidents can happen, and its good to be prepared.
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Fix it right the first time, use Baling Wire !