Search and Rescue Dogs Read the following excerpt:

Have you ever seen footage of search and rescue dogs working at disasters? Have you seen movies or TV programs in which dogs are used to find lost children or track escaped prisoners? Search and rescue dogs save many lives, but they also inspire respect and admiration. They go where we can't go, use senses that out-perform our own feeble versions, and they save lives with the help of their expert trainers and handlers.

Step-by-step, focusing on play-based learning, the dog acquires the techniques needed to find victims. Once the dog learns to find the human without the toy, the trainer will continue working with the dog, hiding the "victim" in more challenging spots, making the trail double back on itself, leaving a trail over a wide range of terrains, or adding another person as a distraction. Trainers also work with dogs in a variety of conditions; rain, snow, and high winds all affect the scent trail. Dogs have to learn how to overcome these conditions to find the scent trail and make the rescue. Trainers spend many hours exposing their SAR dogs to a wide range of situations, terrains, and conditions to make them effective regardless of the rescue situation.

What evidence best supports the idea that training of SAR dogs is rigorous?

Dogs have to learn how to overcome these conditions to find the scent trail and make the rescue.
Search and rescue dogs save many lives, but they also inspire respect and admiration.
Step-by-step, focusing on play-based learning, the dog acquires the techniques needed to find victims.
Trainers also work with dogs in a variety of conditions; rain, snow, and high winds all affect the scent trail.