I have a two year old who doesnt have any withers. When a saddle is placed on him and tightened no matter how tight I get it, it slips. It also sits off his back at the farthest point about an inch. Im trying to figure out what all I need to possibly ad to the tack to get the saddle to sit right on him. Posted via Mobile Device
One good thing that comes out of owning a mutton-withered horse is it sure teaches balance. But, even with a fairly good fit, the saddle is inclined to move if the rider puts more pressure in one stirrup.
My little Rocky is very mutton withered and I had one Hell of a time getting saddles to fit him. I ended up getting a custom made saddle from Crestridge Saddlery for him and it fits great! I also got a supra cinch which is kind of like a double pack cinch, cinching tight front and rear. It really helps keep the saddle in place, especially when getting on and off from the ground (which I usually try to avoid for him). He was always a little cinchy, I think from the last people that had him had to cinch the breath out of him to get the saddle to stay in place. He is MUCH happier now and rides much better. The first and most important part of the equation is saddle fit. No saddle is ever perfect but it needs to be close and not cause pain.
I had this EXACT issue with my extremely fat, extremely wide no wither percheron mix. Nothing fit him, Draft saddles still had too much of an angle of the bars to sit comfortably.
I ordered an aussie saddle from downunder saddlery, they have a line called Kimberly that is very cheap (my leather outback model saddle cost $350, and it is an awesome saddle, it oils well, stands up to abuse, and looks gorgeous). They have synthetics too. You send them the measurements and 'wither tracing' s of your horse from different sections of it's back, they fit you a saddle.
But having a horse like this I've come to learn means all saddles will roll and move around. There's no escape! No breast collar, no saddle pad, no cinch will stop it, but some will help. Good luck!!