Definition of "gambolling"

Seeming himself to recognize that there was nothing constructive to be done in that direction for the moment, he said in a brooding voice that he would take Poppet for a walk. This, apparently, was his invariable method of healing the stings of disappointment, and an excellent thing of course from the point of view of a dog who liked getting around and seeing the sights. They headed for the horizon and passed out of view; the hound gambolling, he not gambolling but swishing his stick a good deal in an overwrought sort of manner, [...]

1960, P. G. Wodehouse, Jeeves in the Offing, chapter VI