Hey my boys 14.3 mw. when on box rest I gave him 10 and he was very sleepy. I havent ever needed 2 give acp 4 clipping but just some advice leave for over 30mins a relaxed place so she can relax. Sedalin is very good which u can get from the vet good for clipping horses.
Big mare was on 2 twice a day to just take the edge off on box rest. Flynn had 2 by mistake - occasionally I have these stupid days - and when we put him out in the turnout area he lay down and wouldn't get up for 2 hours.
Ditto, but ACP can sometimes cause the horse to sweat, which isn't much use for clipping. I've used Sedalin before, but again, please speak to your vet for advice
Can't remember how many I gave my 3.5 yo prior to him going away to be backed. Did check with the vet and however many it was, it did not make the slightest bit of difference to him. He was just as hyper - sorry - no help at all, but it doesn't always work I have been told!