What is the difference between a "Bulldog" and "Rhodesian" shape?
Pipe shape classifications are not absolute. Many pipe makers and pipe companies simply use their own naming conventions and have unique standards for classifying pipes. Also, in different parts of the world, pipe shapes sometimes are referred to a bit differently than they are in the USA.But there actually is some debate about the distinction between a "Bulldog" and a "Rhodesian" shape.
Almost everyone agrees that the quintessential, classic bulldog shape has a straight diamond shank, a tapered diamond stem, and the bowl is tilted forward a few degrees. The bowl shape is like two cones joined together at the base with the "point" of the top cone cut off. Most classic bulldogs also have one or two grooves carved into the bowl where the two cone shapes come together (although some bulldogs do not have these grooves).
Classic Bulldog Shape (Diamond, Straight Shank)
Classic Rhodesian Shape (Round, Bent Shank)
Image Source: www.puff.com
Bulldog or Rhodesian? (Diamond, Bent Shank)
Image source: www.smokingpipes.com
The controversy begins when the shank/stem are bent (instead of straight) or rounded (instead of diamond-shaped). Some feel that any bulldog-shaped bowl with a bent shank/stem is automatically a Rhodesian. Others, like me, distinguish between the shapes based upon the shape of the shank, whether or not the pipe is bent or straight. While this notion does not rise to the level of a "law," I believe it is the most common way of distinguishing the two shapes.
In the end, each pipe maker, collector, and enthusiast will make his own determination. But for me, a bulldog always has a diamond shank and a Rhodesian always has a rounded shank, regardless of straight or bent shank.