The traditional focuses of sociology include social stratification, social class, social mobility, religion, secularization, law, sexuality and deviance.
These were called calceus mulleus, and the name may have been shortened to mules by English speakers. Hence the primary difference between mules and clogs in early days was that clogs were likely to be worn by working people, and mules were fancier and favored by the aristocracy.
Even people making a distinction between burros and donkeys appear to agree that both, being of the species asinus, are asses. This brings us to mules. A male donkey or burro, called a jack, is crossed with a female horse to produce a mule.