One sure sign of a smart Puggle is how they use their paws. When a dog makes extensive use of his or her paws either when playing, investigating objects or interacting with people, that's a sure sign of an intelligent Puggle!
My Puggle, for example, whenever she wants to get my attention or is presenting herself to new people, will stand on her hind legs and put her paws straight up over her head. This is a habit she developed at a very early age, and now she'll sit and put both of her front paws straight up at the "sit pretty" command!
Not perfect, but you get the idea.
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