The gullet, measured inside to inside 18cm where the stitching for the packing is (can be seen on 3rd photo)
The channel is lovely and wide , I can fit four fingers in the narrowest part and my whole hand in the rest.
My fellow in 15.3 and is arabian/ percheron
The gullet is plenty wide enough for him, just the tree shape doesn't sit well on him (whereas - unfortunately - the Bates ones do so maybe I'll have to get one of those. I don't like Bates)
Only As Old As You Feel - Sometimes I Feel VERY Old