Research indicates that all dogs, even those as unlikely as a tiny chihuahua, are descended from the grey wolf.

Dogs entertain humans with their innocence, intelligence, charm, and ability to learn and perform tricks.

Through selective breeding and training, humans minimize dogs' inclination to view cattle and sheep as prey to serve as herders.

An insight into search and rescue dogs with astute noses that use their sense of smell to save lives.

An insight into how working dogs in police and military roles bring down bad guys whether it's a criminal or enemy.

Therapy dogs are trained to provide affection and comfort, and can be seen in hospitals, retirement homes, nursing homes, hospices and therapists' offices.