How to animate a dog running happily

A dog running happily should have a playful, energetic stride. Keyframe the dog’s legs in a running cycle, with the paws moving alternately. The body should have fluid, bouncing motions. The tail should wag energetically, adding to the sense of joy. The dog’s facial expression should be happy and excited, while secondary actions, like ears flapping, will add to the realism of the run.