Which region of the dog should be examined for the presence of external parasites?

The correct option is comprehensive in its approach to examining a dog for external parasites. Inspecting from the base of the tail cranial to the neck encompasses a wide area of the dog's body where various parasites, such as fleas, ticks, and mites, are commonly found. This region includes the hindquarters, torso, and head, which are prime sites for infestation due to their exposure and the presence of fur, making the environment conducive for the parasites to thrive.

By limiting the examination to just the ears, paws, or around the eyes, significant portions of the dog’s body where parasites might also be present would be overlooked. For instance, fleas can congregate on the back and belly, while ticks often attach to areas with less fur, such as around the ears, but can also be found throughout the body. A thorough examination from the base of the tail to the neck ensures that all potential areas of infestation are adequately searched.