A shepherd herds and manages sheep, usually to raise them for eventual sale at a meat market. For sheep, which often means from their pen to a field of grass where they graze. Therefore, the shepherd shepherds the sheep to the area from their pencil.
A pie is composed of pastry formed into a bowl which will have a staple food product that the baker chooses (meat, vegetables, or fruit). With that done, the item could be called something other than a pie. When the baker adds a pastry cover (top or lid) then bakes his or her invention, he or she has baked pie. The name shepherd’s pie implies that mutton (the meat of sheep) got baked into the dish.
You know the title for prepared food products which were not all consumed: leftovers. Shepherd’s pie, a freshly-baked demonstration of kitchen leftovers, provides a baker with a range of opportunity to spruce up an otherwise B list meal while clearing the refrigerator of older, yet useable food before it spoils. I have seen the name”cowboy’s pie.” A pie will eat (taste) the same if the name changes; the pie itself remains the same. Cowboys herd cows, as shepherds herd sheep.
Speaking of cows, western Americans prefer the title cows, and they detest the term boy when referring to themselves and their tradition of herding cows. They enjoy cattlemen better. Wellington Raccoon Removal pie functions then, doesn’t it? It also sounds better than cowboy’s pie. Probably, we should let go there, because cattlemen don’t usually herd cows, which live in barns, create dairy products, and create little cows (calves).
Cattlemen herd steers to the meat industry. Steers, young castrated bulls, must be used up before they become oxen (massive feed-consuming beasts once used to haul heavy burdens in carts). We don’t require oxen anymore since we have trucks to haul heavy burdens. If you prefer to eat beef and hamburger, then you understand the use of steers. But, you probably don’t want to consider a pie made with leftover castrated bulls.