The Incredible Journey, 1963
Before there was Homeward Bound in 1993, There was this original flick about an old bull terrier named Bodger, and a Labrador retriever named Luath who team up with a Siamese cat named Tao to find their owner, who they missed after being dropped off at a friend’s house for the summer. But a cross-country trip that involves a 250-mile journey? Come on!
Source
//www.youtube.com/watch?v=WKJChEYLVaU