My horsie has no withers and his saddle slips a lot, mainly to his left ie the side that you mount. I am concerned because I have just read that riding with more weight in one stirrup or with more weight in one side of your seat, you can cause the horse to become really 'one sided' and his muscles will become over developed on one side. As he is a little overweight and I am bringing him back into work and building up his muscles, its a worry that he will build them up all wrong because of this problem!! I was wondering if you could give me some suggestions as to what I can do. He came with the saddle that he has on and the previous owner says that she knows about this problem and this saddle and the numnah she has given us are the only ones that keep his saddle in place (apparently she has tried lots of different ones)...however, they dont really seem to be working! I really cannot afford a new saddle right now so I cant really get any tack fitted especially for him. If your horse has no withers, what type of tack and numnah do you use for him? Also, does the girth matter? He came with a humane girth (elasticated). People have said to me that his tack will probably fit a lot better and the saddle wont slip when he's fitter and is less fat but I really dont think that its a good idea to just 'put up with' a saddle that is slipping and could cause him to become very one sided. Any help would be appreciated!!