We always defer to breed experts here, so we welcome clarification or corrections, but it’s our understanding that the “bone mouth” dog is the older, original type of the Shar Pei, so called because of its “dry” type of muzzle and regarded as the “Chinese type.”
“Meat-mouth,” conversely, is so called because of its “meaty” type of muzzle with loose skin. Some sources also refer to the meat mouth as the “American variety.” We did come across one site that referred to “tweeners,” or meaty bone mouth dogs which fall between the two other types. Perhaps one of our Shar-Pei friends might share a picture of such a dog?
The AKC breed standard makes no reference to neither the bone mouth, meat mouth or “tweener” types.