A Clydesdale is not a scaled-up riding horse, and saddle fitting goes wrong when it is treated as one. His back is broad and comparatively flat, his shoulders are massive and built for pulling, and his sheer weight means a pressure point that would merely annoy a smaller horse becomes a genuine problem under a rider. The checks below follow the order a fitter works in: tree width first, then contact, clearance, and stability, each judged on this horse's actual shape rather than on what usually fits.
Tree width and the level seat
Start with the tree. Most Clydesdales need a wide or extra-wide tree, and some need a saddle built on a draft or hoop tree that matches the rounded shape of the back rather than the peaked shape of a riding horse. With the saddle placed ungirthed, the seat should sit level, neither tipping down at the front, which signals too narrow, nor perched and tipping back, which often signals too wide. Look from behind: the saddle should follow the spread of his back. Look from the side at the pommel and cantle balance. A tree that is too narrow on a draft horse pinches at the points either side of the wither and lifts the back of the saddle clear of the back, concentrating the rider's weight into two sore spots on an animal who may be too stoical to complain clearly.
Panel contact: no bridging, no rocking
Run your hand under the panels from front to back, girthed as for riding. Contact should be even along the whole length, with no gap in the middle. That gap is bridging, and on a broad, flat Clydesdale back it is the commonest fault: the saddle touches at the shoulder and the loin and hovers between, so every stride loads two small areas. The opposite fault, a panel that rocks when you press pommel and cantle alternately, means the saddle's curve does not match his flatter back. Check also that the panels end on the ribcage and do not extend past the last rib onto the loin, since weight carried behind the ribcage on a horse built like this is weight his back is not designed to bear under saddle.
Clearance: wither, spine, and channel
Clydesdales have less prominent withers than riding breeds, but clearance still matters. You should see daylight through the gullet along the whole spine, with the channel wide enough that nothing presses on the spinous processes, and two to three fingers of clearance over the wither once the rider is mounted and the saddle has settled. Check clearance again after riding, not only before, because a broad back spreads under load and a saddle that looked clear in the yard can come down.
Shoulder freedom and stability in motion
Watch him move. The saddle should stay centred without constant correction, and the shoulder should swing freely, not shove the saddle backwards with each step or strike its edge. A Clydesdale's job-shaped shoulder moves a great deal of muscle under the front of the saddle, so allow the saddle to sit a fraction further back than riding-horse instinct suggests, provided the panels stay on the ribcage. At trot, watch for the saddle lifting at the back, slipping sideways on turns, or creeping forward downhill: each points to a specific mismatch of tree, panel shape, or girthing.
Record what fits this horse
A fitted draft saddle is hard-won knowledge, and it changes as his weight and muscle change across a working life. KinsLe's Pet Passport keeps your Clydesdale's saddle measurements, tree details, and fitter notes together with his other records in one portable packet, so the next fitting, or the next fitter, starts from what already works on this horse.