Monday Answer
I'm thinking that the dogs question was unclear--as the responses were few. No star this week.
"Scoundrel" dogs, feet "dogs", girl "dogs", boy "dawgs", and dog dogs, are all carbon based and as they say 'round here dint count and had to be excluded. The dogs I was looking for related to the generic dogs of the bench and the vise. The bench dog limits the movement of things by being anchored on/inserted into a bench and the workpiece being placed ag'in it. The vise dog enables a work piece to be held firm by raising a solid captured wood or metal piece above the jaw on a woodworking vise then tightening the hold of an anchored piece by screwing in on the other end with the jaw of the vise. Dogs can be made of most any material. It's not what their made of but the function that makes them a woodworking dog. This answer would also have accepted all those useless, poorly designed, expensive and/or dangerous tools that we all have purchased, but rarely admit to and are banished in the back corner under a load of dust. Now there's a trivia question to ask. What is the worst tool you ever listened to the hype on only to find it a "dog"? Feel free to add your nightmare.