This coloring page features a curious scene: a dog standing in the middle of a room, looking at a slightly open door. On the other side of the door is a cat, also clearly just as curious about what lies beyond. The suspense of the two animals wondering what is on the other side makes for a wonderful coloring opportunity, as viewers can let their own imaginations decide the potential outcome. To bring out the mystery, you could use darker colors for the dog and cat, such as blues and purples, and a lighter color such as yellow for the door and its frame. By using this combination of colors, the viewer can really focus on the animals and their curiosity about the other side of that door.