what causes dry spots
Myanswer to that is saddle your mule that wayand head out on a 200 mile ride and leteveryone know how far you get before backproblems bring the trip to a screeching halt. Another cause of dry spots can be old in-juries. Old healed saddle sores may be thecause of dry spots.
Even a goodfitting saddle can slide forward on a mulewhen conditions are right. In this case theaddition of a properly adjusted crupper orbritchen is needed to keep the saddle whereit belongs. At the same time, a mule with theright confirmation can cause a saddle toslide too far back and cause dry spots.