This is the intro from the second series based on the Heathcliff comic strip. The series premiered in 1984 and a total of 86 episodes were produced by DIC Entertainment. Various episodes from the show have been released by both Shout! Factory and NCircle Entertainment. The entire series is still unavailable in a complete package or in volume sets. Unfortunately, Shout lost the rights to the series a few years ago, so I don't think we'll be seeing every episode get an official release any time soon.
Heathcliff Cartoon Intro