Just making sure that I understand correctly. You own the horse, and are partially leasing him to the 4H barn? You are getting a break in the cost of the board in exchange for allowing them the use of the horse in lessons? If that is the case, then you could certainly cancel the lease agreement. Your horse will lack exercise during the week, but may be more tractable (have less energy) for your daughter when she is riding. I can see that there may be more than one issue. The first would be that your daughter is not able to ride as often as a horse needs to be exercised, so if other people are riding him, his training is (potentially) progressing faster than hers is. So when she tries to ride, he is reacting to cues that she is unaware that she is giving, or alternatively, he is not reacting to cues that she believes she is giving. it is possible that her level of ability as a rider is less than the horse's level of sensitivity, and he is reacting honestly. The interpretation by people is almost always that the horse is at fault and is misbehaving, when the reality is that the horse is doing what it is being asked to do. (Whether you mean it or not!) The second would be that the horse is being over-used and is turning sour. It is not necessarily true that 'the more he is ridden, the better he will be'. Horses need time off every week, just like people do. They need to be used for a certain amount of time in a day, and not longer, and they need work that does not just irritate them. Not all horses have the disposition to be lesson horses. So if your horse is being ridden five or six days a week, one or two times, that would be ideal. Sometimes, three times is fine. I don't mean going three hours in a row, either, I mean a morning, afternoon and/or evening training of between 20 minutes to 60 minutes per time. Having said that, it is rare to never that a very experienced rider cannot convince a 'sour' or overworked horse to do what it is asked. The solution for the sour horse is to determine what its current workload is, and then make a more reasonable schedule. Thirdly, there is the possibility that the 4H barn instructors are not very good, and the riders are not being taught properly, and they are damaging his training or attitude. They may be riding too hard, using wrong bits, spurs, who knows? There is the possibility that they are 'ruining' your horse. In which case, you will have to insist that they do not use him for lessons. It would be a good idea to find a rider who you are happy with to ride him during the week when you cannot come out. Has he changed for the worse since you brought him to that barn? Was he different before, and how was he different?