You already know a wagging tail means “happy,” but it’s the direction that matters. A tail wagging more to the right side of their body is a sign of positive feelings, like when you walk in the door. A left-sided wag can mean anxiety or uncertainty—like when the vacuum cleaner appears.
Watch for the “helicopter tail.” That’s when their tail spins in a full circle, like a tiny propeller. You’ll see this when you grab their favorite toy or say the word “walkies.” It’s the dog equivalent of a happy dance.