Right, I've had a look and here's my two pence (sorry to reply on the forum rather than to your email but I'm at work and typing this on an iphone would have taken aaaaages):
in 6.3 - just check the wording slightly, it looks like you're missing a few words.
I see what you've done with para 8 and the farriery but it's a little ambiguous - could you possibly say that you will arrange farriery and inform the sharer, and she is obliged to make the horse available to be shod should this be during "her time", and tidy up the bit about payment, saying what proportion of the bill she pays, or whether payment responsibility falls on you (as elsewhere you've already stated her contribution)
para 9: maybe say "the sharer shall" rather than "is expected to", again for the avoidance of doubt.
para 10: I would add "nor may they purport to do so" at the end (my mum advised me of this for my contract & she's a lawyer, although I thought it was a bit much)
Am I right in understanding that your horse is going to be on alternative livery for a few days a week and then back with you the rest of the time?!
Sorry if i've bombarded you with suggestions, I hope you find them useful
Maletto - yes, its a comprimise to the situation at the moment. If any more hassle about the whole thing then I will just be calling it a day as its stressing me out now! The alternative place is literally 5-10 mins walk up the road, if that. Just that its easier for sharer to get to as they will get a lift with the person who has her horse there.
The fact that it is ME that owns the horse seems to be getting forgotten in the whole thing. I'm going to give it a few more months then see how it goes. They seem to think they will have him for AGES yet to do x y and Z with, but he is 15 next year and I think he is slowing down a little (although he does have hte odd explosive moment!). So I have decided to be more restrictive with him.