Lorna, My horse does the exact same thing! She has had her teeth floated, been completely checked over by the vet, had her feet done, etc so I know it's not because she's in any type of pain. I also know that she does it more when she is asked to do something that she doesnt feel like doing (speed up from a walk to a trot, make circles to her left, etc). As long as she is doing what she wants to be doing she doesn't toss her head, but if I ask her to do something she doesnt want to do at that time then she starts to toss her head. It's not a high toss or fast toss, just like she's saying yes very gently. But she also looses her balance when she's moving and does it because she can't consentrate on what she's supposed to be doing and throw her head around at the same time. I have not found anything that makes her stop besides making her work more until she stops doing it, then I let her rest and tell her 'good girl'. I'm hoping that she will eventually associate Toss = Work/ No Toss = No Work. Have you figured anything out yet with your tosser?
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