Almost every book one reads on newborn puppies clearly states there are no brainwaves present in these puppies.
When there are no brainwaves present in a human being, they are considered brain dead; they cannot even breathe on their own. Maybe they need to get a machine that can accurately measure puppy brainwaves because they clearly are breathing on their own. They squirm, cry, nurse, pump their little paws against their moms, some of them doing so very loudly. They sleep, wake, and are able to make their way back to mom. If they had no brain waves, clearly none of this would be possible.