This show was and remains my favorite cartoon of all time. In a world of superheroes and lovely, happy fantasy worlds, this cartoon stuck out. As a young child when this was still airing, I'd find myself awake "late" at night (any time after the sky was dark) feeling transported to another world. Courage actually gave me the courage to watch the entire episode without feeling scared. He was only a dog and he knew how to handle it and save the day.
I'm not gonna lie, this show gets very creepy, and can cause nightmares. There are characters and noises clips that stick in my head to this very day. That's what made this show so good! It was entirely creepy, yet never inappropriate.
It could take fears all kids had at some point, materialize them in the form of a cartoon, then have a dopey yet awesome purple dog figure things out and save the day. I love it!