My horse has been on pergolide since last summer...he was holding up his back leg before pills and fell down...callapsed when riding him..walking....he is no longer holding up his leg and canters ...trots nicely but hv tried a couple times to ride him and he has dipped in the back a few times....do u think he will ever be ridden or is he just a companion horse now...he is 25...I've had him since he was 3....he has been to vet and chiropractor....he is stiff in the back....vet said he has Cushing and arthritis Sandralyn Texas