Yes, there was a program called Heartbeat on television and for many years there was a dog in that called Alfred he was a Lurcher type but scruffy looking. He reminded me of a very special dog I once had.
I want to cheat and choose Scooby Doo, he has always been a favourite of mine, but he also reminds me of Megan because like him she was the least brave dog you could ever meet, but it was surprising what she would do if rewarded with food!
I like "Dog". He was on Petticoat Junction and numerous other shows back in his day. In fact, he was the original Benji in the first theatrical film. He was just cute as can be.