Smudge is a plump black-and-white tom with amber eyes.

Smudge is a kittypet that resided in the Twolegplace near the old forest and the former neighbor of Firestar when he lived as a kittypet named Rusty. The two were close friends as kittens, and though Rusty's departure to join Thunderclan left Smudge saddened, he ultimately accepted his friend's decision. Despite their different paths, Smudge and Firestar remained on friendly terms whenever crossing paths. He also was friendly with a Bloodclan queen Gremlin and would let her meet Graystripe in his garden from time to time. Moons later, Smudge told stories of the clans to kittypets that inspired them to imitate some of the Clan ways, calling themselves Warriorclan.