Whys my horses attitude towards me changed so quickly?
I bought my 9 year old cleveland bay x tb 3 months ago, she wasnt well schooled but that was something I was willing to work with and after a few weeks she was improving quickly. However over the last few weeks her attitude has changed completly, she's agressive and snappy in the stable, putting her ears back at everyone, and if anyone approaches her with a saddle she will try to bite and make a fuss whilst having the saddle put on. Once being ridden she goes well and is happy and willing to ride. Why has her behaviour changed so quickly? She's out with geldings and mares so I think it may be a behavioural problem of her being dominant and trying to be the top or the herd with me aswell as the other horses? Any help will be appreciated, its got to the point where im considering selling her, and I really don't want to have to do that, to start with we got on so well I don't know whats changed. Thankyou x