Definition of "strutting"

When dogs fight, there are usually preliminaries to the actual combat — snarlings and bristlings and stiff-legged struttings. But White Fang learned to omit these preliminaries.

1906 May–October, Jack London, White Fang, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., published October 1906, part 3 (The Gods of the Wild), pages 144–145