As a breeder and self-proclaimed puppy nerd, one of the parts of puppy raising I look forward to the most is stacking up puppies and taking head shots. Stacking them up allows me to evaluate them against each other (and hey, I now understand the term, “stacking up,” means!) to determine which ones are more structurally correct than the others. Head shots also me to see the same thing in their faces. One thing that’s undeniable: the puppies are adorable.