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Can old dogs learn new tricks?

Many of these old adages can’t be traced back to their origins, but the reference to senior dogs and their learning capacity has a documented origin. The source of these well-worn words is an English gentleman named Fitzherbert who wrote a treatise on animal husbandry in 1523. In the cumbersome vernacular of the times, he said that “the dogge must lerne when he is a whelpe, or els it wyl not be; for it is harde to make an old dogge to stoupe.” In today’s language, Fitzherbert’s words might be roughly translated as “The dog must learn when he is first born or it is hard to make an old dog comply.” Or more simply put, “You can’t teach an old dog new tricks.” But, is there any truth to those curiously spelled old words or the more familiar translation?