What kind of camera are you using? A lot of times with cameras you have to step back from your subject and then zoom in a little. The first setting on most lenses is wide angle, which is meant for landscape. If you shoot a person or pet with this setting it will make them look disproportionate. You don't have to be a long way away from your puppy but you do want to be far enough away that you have to zoom just a little. Doing that should help take care of the big head look.
Kolt Ammo Vom Geschenk "Ammo"