For thousands of years, dogs were working animals not just pets, carefully bred to hunt, guard, herd or retrieve. Now these instincts are turning some dogs into problem pets. This film follows a bloodhound called Holly and a bearded collie called Herbie, who both face an uncertain future in rescue homes because they are so out of control. In order to give them a second chance, professional trainers see if they can be put back to work, sniffing out criminals and herding sheep.