Okay so, as most HEE people may know. I do not own a horse anymore and I take care of/ride other people's horses just to get more experience in with working a lot of different horses. I have a friend who I have talked about a while ago who still has her mustang filly and yes, I am still working with that filly >.> But here lies the problem, every time I go out to work with the mustang it seems like all of my training I did multiple times is gone every single time because my friend's younger sisters mess with the horse and RUIN EVERYTHING I have done. Don't ask me how because I honestly do not know how. I am not out there every day like I want to be because I still have a life, family, school, and work. I could make it out to her place 2 times every week and that's it for now until summer break comes. Starting this summer I am going to saddle train the mustang and hope no one ruins it. Is there ANYTHING I could do to prevent my friend's sisters from undoing all the training I have done? It gets old redoing the mustang's ground training because when I have her going good and out of my space and all that jazz when I come back she is all up in my business and tries to run me over and it is seriously starting to piss me off. I do not want to just ditch my friend and say "I can no longer work with your horse because your sisters keep undoing my training." But I am at a loss of ideas on what I should do.

Its not your horse. Unfortunately theres not much you can do or say without potentially stepping on some toes.

Well, is it your FRIENDS horse or her sisters? Because you could talk to your friend, because it's a waste of your time to redo all of her training everytime you come out.

Yup, what Jello and SM said...talk to your friend, and possibly her sisters too. Explain why the horse behavior(s) are undesirable and potentially dangerous. Many people just simply don't understand that a horse that is in your space has a HUGE potential to kill/hurt you without meaning to.

Jellos Warmbloods said:
Its not your horse. Unfortunately theres not much you can do or say without potentially stepping on some toes.

Maybe try getting the sisters out with you and you can teach them how to continue "training" her, or how to correctly interact with her?

I have tried but they are those kids who think they know everything and don't have to be taught how to train a horse. Mind you they also run around the horses and scream and fight near them too

Some times kids need to learn a hard lesson. I worked with a horse that was pretty much bomb proof once, but if kids were running around him and screaming, he would pin his ears back and bite them, and if they got close to him he'd give a well aimed kick to their leg or step on their feet hard. Needless to say this horse taught these kids manners around horses, cause if they pulled that crap around other horse, all this horse would do is give them a look and snap at them. The kids behaved afterwards.

I am going to play the devils advocate here right quick. If you are only out there 2 times a week, a young horse is likely to relapse and lose some of the progress you made. It is just the nature of the beast with young horses. Say you go out 2 days and mess with her, remind her of her manners and boundaries, what she learns with you will start to slip, especially when she is learning from others that personal space/etc. isn't always a hard and fast rule (and it should be). Once again playing the devils advocate one could argue if it bothers you working though the same issues you should drop the horse or start going out more often.