Police are now searching for missing dog Bella who was taken from outside Tesco.
The female English springer spaniel was taken from outside the Tesco Express store in Bridge Street, Rothwell, at about 7.20pm on Saturday, October 10.
The adult dog had been tied to a tree while its owners went into the shop.
At that point, somebody untied the dog and walked off with it in the direction of Market Hill.
The dog, which is pictured, is white with black ears, black markings on its body and spots on the left side of its muzzle.
Witnesses, or anyone who knows anything about this incident, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.