The tail that wags so hard it seems like the whole body of your dog is wagging. The wonderful wagging tail that says "welcome home Mum [or Dad] even if you have only been away for half an hour. The tail that wags when you talk to her or him. The tail that wags to tell you that she or he loves you as much as you love her or him. Can there be any better way of a dog showing their love for you?
