My girlfriend's horse, a beautiful copper Appy gelding 7 yo, had trouble moving forward. I also used a crop to get him going, but we don't want to rely on such heavy-handed aids. So we always ask with this sequence: squeeze (you legs), cluck, spank. When he responds to the lighter aids we praise him and let him have a short rest. Sometimes he would refuse when we forgot the crop, and I mean refuse to move an inch (I know, what were we thinking?), or sometimes he would shake his head and make me worry he might buck ( he carries his head nice and low at canter). When he does these things, I get off and make him lunge. I go after his butt with the end of a lead rope like I plan on killing him. I make him move fast and hard. Then I get back on and squeeze, click, spank. If he moves, I praise him. If he doesn't I jump down and do it again.
The key to making this a short term problem is to always start with the softest of requests first, your squeeze. Your horse will quickly learn to respond to your first request. You have only had a month with her, and it takes time, but it has worked for me!
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