Disclaimer: This article is intended for a United States audience. Laws, training standards, and service dog regulations may vary by country. Readers outside the U.S. should consult local guidelines ...

In short order, Teddy -- a bright-eyed and bushy-tailed 3-year-old yellow Lab -- punched a wall button with his nose, yanked a rope to open a kitchen cabinet door and tugged a walker across the floor.

In a world where there's no one to support you in your bad times and where human beings are crushing each other just to ...