My mare will trip which seems to be at random(hills, flats, walk, trot..). She has injured her leg before but she can move fine and smoothly. I have the farrier trim her hoofs every 2-3 months and they are not even that fast growing. I believe she gets distracted with the surroundings or lazy (a little of both) and does not pick up her feet so she trips. What could I do to help her not trip so much?