Wagging tails and friendly question marks
Dominant dogs keep their wagging tails high, while relaxed dogs hold their tails in a relaxed U shape. When a dog is excited, their whole body shows their excitement. Their ears and body are relaxed, they have a relaxed, non-staring gaze and its tail wags happily.
A cat can use their tail to let everyone know whether they want them to approach or not. Is a cat happy to see you or curious? In that case, their tail will shoot upwards. When your cat feels relaxed and is happy, their tail is vertical with the tip curling down like a U or a question mark.