Why is a cow called "Bossy"?

'Bossy is a general name for a cow, just as Dobbin refers to a horse and Tabby to a cat. The Latin word for ox or cow is bos, and it is probable that the first person to call a cow Bossy was equipped with both a knowledge of Latin and a sense of humor. Some authorities, however, suppose the term to be related in origin to the dialectic English word boss calf, a young calf. In the Teutonic languages there is a root word variously spelled bos, boose and buss, which means barn, stall or crib. The thought is originally a boss calf was a calf kept in a barn or stall as distinguished from one grazing at large and that bossy as applied to a cow is derived from the same source.'

From "A Book About A Thousand Things" by George Stimpson.