Not every stolen dog finds his happy ending. In fact, dognappings are on the rise across America.
There's a lot you can do to prevent that. For one thing, Petfinder notes, it's a lot harder for thieves to take your pet if he's inside the house while you're away, rather than in the yard.
Keep your home secured when you step out.
Leaving your dog tied outside of a store dramatically increases her chances of being taken. Spaying or neutering your dog may also dissuade thieves who intend to use her to breed and cash in on the puppies.
And if your dog does go missing, whether lost or stolen, microchipping - a way to identify pets if they show up a local shelter - has proven crucial, time and time again, in reuniting them with their owners.
Also, as we've seen in Knox's case, having lots of clear pictures of your dog from every angle is an important tool to get the message out about a missing pet.
For more information on microchipping your pet, visit the Humane Society of the United States.