For the Love of Benji (1977)

Benji gets lost after a flight overseas and becomes a stray in Athens, Greece. He then tries everyday to reunite with his family while mysterious people pursue him, in a race to get a code which was secretly tattooed on his paw at the airport. But who are the bad guys and who are the agents that can be trusted? Will Benji and his kids and their nanny ever get to enjoy their vacation?