Cat
From Halopedia, the Halo wiki
The cat is a domesticated animal kept by Humans as a pet. Known cats include Jonesy, pet of the UNSC Pillar of Autumn crew member, and a cat named Spock [1] onboard the UNSC Spirit of Fire, and a cat rescued off a church roof by Janissary James.[2] Another cat can also be seen in the concept art for Halo Wars, sitting on the bridge of the Spirit of Fire. Also, in Halo 3 and Halo 3: ODST a cat with a bow called a tom cat can be used as your emblem.
