If the behavior is constant, her cycle is not your problem and Depo wasn’t your solution.
I have a mare who sounds like yours, but the behavior was consistent. Her issue was saddling. I tried everything.
Three things solved it, in this order (in a sense). I mean these were the things done in order to time, not necessarily importance.
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She lives out 24/7. This is a mare who is a tad defensive about her space in a stall anyway. She’s also one who really does use her turn out and runs around enough that you can appreciate how hard the stalled life would be for her.
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Changed her grain/feeding to grass hay, Redmond salt and alfalfa plus Soy Bean Meal for high protein with a complete set of Amino Acids. There’s a vet out there who has a whole philosophy and (simple and cheap) feeding program mean to correct protein deficiency in horses.
I’ll tell you what, this feed program leveled this mare right out. And she had had ulcer treatments, been fed ulcer preventives, lived on Regumate for a while, yada yada. I’ll tell you more about the behavior changes if you like, but this feeding program is reputed to produce calmness (at least about food) in lots of horses.
- I taught her to slow down and relax while I approached her with saddle pads and a saddle. My system was a touch different than what Foxglove wrote, but along the same lines. Kashmere’s point about not correcting what you don’t want, but teaching her do actively do something you do want is excellent, too.
The funny thing about this is that once I taught her to relax, I don’t have to go through any special rituals now to saddle her. It surprises me, but for as long as she had been ridden, everyone had just muscled her through the bottle neck of saddling her and probably wrote it off as “just her.” But once she was taught to do otherwise, that became her new normal.
BTW (and it was/is part of my way of training horses to accept me doing things to their body), you can/should try that middle spot between her being loose in her stall and her being tied-- halter her and keep the lead rope in your hand. Thing of it this way-- the blanket is “the assaulting world” that is just going to happen to her and which you want her to accept. Your hand is “you/her leader” who controls and/or reassures her. I’ll explain fully how I’d correct your mare, along the lines that I taught mine to be saddled, if you want that.
In any case, I can’t tell you how much you can get done with a horse who is very broke on the ground by holding the lead in your hand (even if they are tied) and keeping a connection with them. Now it feels weird to me to put my body so close to a flight animal without that line of communication open.