Before pooches become the trusty, life-saving K9s they are destined to be, they have to go through vigorous training. And as tough as they try to look on their first day -- just like any first-grader -- they can't shake off...

Before pooches become the trusty, life-saving K9s they are destined to be, they have to go through vigorous training. And as tough as they try to look on their first day...