Slipping saddle? High withers, small shoulders.?

I am not sure what style of breast collar you have tried; whether it was the kind that is like a level strap across his chest such as http://www.doversaddlery.com/wellington-jumper-bre... , or the type that a fork can be attached to, so that it is like the lower part of a running martingale such as http://www.doversaddlery.com/brass-fitted-breastpl... .

Even if a breast collar doesn't work on him, a yoke such as http://jockeytackproducts.com/products/430-nylon-y... , might at least keep the girth from slipping back. Note that a yoke simply encircles the base of the horse's neck, with no connecting straps to the saddle itself; plus has a strap passing between the horse's front legs ending in a loop for the girth to pass through. Yokes are frequently used on race horses to keep the girth in place.

I don't know, never having used one, whether a shaped girth such as http://www.doversaddlery.com/dover-comfort-contour... might help.

Or a cord girth like http://www.doversaddlery.com/trevira-cord-girth/p/... or http://www.doversaddlery.com/product.asp?pn=X1-021...

I've had this happen to me. First, is his coat nice and shiny? Do you spend lots of time brushing him and such? I know this sounds really stupid, but once when I was doing manes, I got some Showsheen on his back. Made him slippery for MONTHS! Every time I rode, the saddle slid about 4". While you might not have the same exact problem, here's what I did:

Changed to a more natural saddlepad, not the synthetic one. I used a Dressage pad along with the saddle pad. I used some Hairspray to sticky him up (also good for a bareback riding class!!)

To help the back, I used a thick foam wedge.

Lastly, I figured out the saddle was the wrong type for his shape - Large Withers!! I went from an all purpose saddle to a Sr. Event Saddle and have never looked back!! It put me in a different position and seemed to help us.

But that was like 16 years ago. Still miss my Derby!!

For a Western saddle, the swifter answer could be a saddle with semi-Quarter-Horse bars and a extreme gullet. even although, i've got had fulfillment setting up horses formed like yours using the two a Western Arabian saddle, or an previous extreme-backed saddle outfitted on a slick-fork tree (make confident its in existence like driving subject). a number of the very previous saddles that have little to no swell, might have a extreme gullet and could in good shape an extremely slender horse. i might attempt a cutback saddlepad (that has a hollow cut back out for the withers) first. If that may not adequate, i might attempt a outfitted-up pad, the variety it is thicker on the front a million/2 than on the back a million/2; additionally with the withers cut back out. (sometimes stated as a barrel pad). If neither of those pads works, i might spend a sprint extra money on my pad and get one that could be crammed with air to regulate it to the guy horse's back. i might additionally use a breastcollar in this horse to assist the saddle stay in place extra advantageous.

Here are some things you can try:

Use a thicker pad to add tightness to the girth and make it less of a slope down his back: Try getting a specially made pad if you have the option and money.

Use a girth without an elastic.

Get a close ocntact saddle.

I'm just guessing, but grass reins might help.

http://www.myaushorse.com/classified/images/Pictur...

Not it's intended design, but still might help.

Non-slip saddle pads (some examples)

http://www.horsingaroundllc.com/images/new_product...

http://i14.ebayimg.com/04/i/001/40/83/43c2_35.JPG

http://images.auctionants.com/pc-non-slip_pad.jpg

http://t2.gstatic.com/images?q=tbn:ANd9GcSEptWYn8X...

You can try wedges. Ive used them before, rode a Dutch Warmblood with High withers but semi-narrow shoulders.

Take a look at these for the different types.

http://www.doversaddlery.com/product.asp?pn=X1-191...

http://www.doversaddlery.com/product.asp?pn=X1-192...

http://www.doversaddlery.com/product.asp?pn=X1-194... (this is the one I used on the dutch warmblood)

They also have ones with gel pad builts in so this way its helps comfort the back. Hope this helped.

you can get thick reastplates at horseland