Burr's thick pelt is smokey grey with an indistinct darkening of his guard hairs and lightening of his ventral fur. His only distinguishing mark is a band of pure white fur that loops around the back of his neck, tapering at his shoulders. Although his palette and pattern are both unremarkable, Burr is made recognizable by a tail that curls over his hindquarters like a plume while at rest. He is tall and gangling and has warm amber eyes.