This half-hour show had a mixed breed stray dog named Boomer (Johnny) that would enter people's lives and help them solve their problems. After helping out, Boomer would travel on down the road looking for other people to help.
I loved this show when I was a kid. It was about a dog who traveled from town to town helping people in crisis. It probably sounds unrealistic, but it didn't seem that way at the time. Eventually the format was changed to where you could hear what Boomer was thinking, but that twist was shelved as was the series itself shortly thereafter.