I hope the little pup has already been found. This poster is curiously lacking in information. (Though I can infer from the handwriting that the person who made it, the owner, is female.) Usually, lost pet signs include the name of the animal, its gender, where it was last seen, and when.
Pix and other images 
Oh dear, people do steal dogs. how sad. I so hope this little dog is returned. Some people steal dogs, hold on to them, and then wait for such a sign when they ask for a reward. Bastards!
I hope that fellow is reunited with his master or mistress.