Horse losing power in hind end/unhappy when ridden

[BigMick]

@2tempe

You might want to have the vet do a neurological test. I had a TB who developed cervical arthritis; its early signs were some loss of backend power and unwillingness to maintain canter. Later there was the feeling of a wonky stifle - like the one hind leg would just be left behind…The first neuro test pretty much eliminated the more usual suspects, we did EPM test to be sure but films of the neck showed the problem.

exactly my thoughts (and experience).