sorry to sound stupid, but what exactly does it mean? And how much is the cost usually, hows it worked out? I'm in Ireland (in case that makes any difference!)
Thanks
Sam

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It means you share the horse with someone else (usually, but not always, the owner) You share riding and care and expenses (stable rent, cost of food, farriery, etc.,) with the other person. Also referred to as part loan. An owner usually enters into such an arrangement because s/he cannot afford either the time or the money or both to keep the horse him/herself - In my case I wanted someone to hunt the WH because it is
his favourite thing in all the world and
I have more sense

so you can see that there are all sorts of reasons why the horse may be available for part loan.
It is just as important that you choose a share as carefully as you would choose a horse you were buying. And it is essential that you like and get on with the other sharer! Sharing is a good way to introduce yourself to horse ownership as you have someone to ask if you are worried about anything or you plain don't know what to do. It's also a good and relatively painless way to discover if the responsibility and hard work involved in horse-keeping is for you.