I purchased this 14 year old mare about 2 years ago. My grandchildren rode her and she looked great, although she did take a fall when stepping in a hole. My granddaughter did not get injured thank goodness. This mare seems to stumble/trip more than normal in my opinion. I got rid of my other moody mare and now am paying more attention to this horse which I was told is a Missouri Trotter. She does trot smoothly both slow and fast. Most of the tripping is from a walk. I am trying to get her into shape, but at times I feel she is telling me she is whipped and I do stop. This horse is bombproof unlike the one I gave away, so I hate pushing her too hard and I am more concerned that she might just be weak kneed or weak ankles....I like her, but either she is conning me or maybe is injured. Any suggestions?