Here's a great piece of 2009 comic book cover art for Guardians of the Galaxy #15. It was created by Salvador Larroca, and features Rocket Raccoon and Cosmo the dog. Cosmo was briefly introduced in the movie, and I hope he has a much larger role to play in the sequel. These two characters don't really get along with each other, and it would be a fun dynamic to play with in the movies. I don't know if you remember in the movie, but when they cross paths they growl at each other. Some of you may or may not know this, but Cosmo is actually head of the security forces in "Knowhere" (the giant celestial head), and he's telepathic.
Thanks to XombiDirge!