Cocker Spaniel, Poppy, was stolen from a property in Dunscroft in February along with another dog called Tinkerbell.
Using a microchip scanner borrowed from the Doncaster RSPCA, officers were able to trace the Tinkerbell to an address in Doncaster.
Poppy, who is chocolate-coloured, is still missing, however, and officers are appealing to members of the public to help them trace her.
A spokesman for the Doncaster East Neighbourhood Policing Team said: "Please let’s try and find this young lady and reunite with the family. Poppy is also microchipped."