My 12.2, 7 year old mare has just started, bucking before the canter, Why and how can I stop her?

I ride outdoors, in a free area, not gaited in, Have seen white patches in her sweat mark. or:I ride outdoors, in a free area, not gaited in, Have see

I ride outdoors, in a free area, not gaited in, Have seen white patches in her sweat mark.

or:I ride outdoors, in a free area, not gaited in, Have seen white patches in her sweat mark.

or:Have all of her gear checked, take to the vet and call the blacksmith somthing may be wrong with her feet.

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