Caged — Norah McClintock

Even if Kenzie's dog had somehow managed to escape from the family's fenced backyard, Kenzie knows the big, lovable chocolate Lab wouldn't have gone far. As they search for Clancy, Kenzie and his dad keep hearing stories about other dogs that have gone missing too. When Kenzie finds Clancy's ID tag and spots a van loaded up with dog food, he knows he has to investigate further. With the help of a schoolmate whose dog has also disappeared, Kenzie uncovers an illegal operation that grabs dogs off the street and turns them into bloodthirsty killers.