During the scene on Knowhere when the titular heroes met up with the Collector in his museum in Guardians Of The Galaxy, one of the Collector's exhibits was a dog wearing a spacesuit. The dog was later seen, having escaped its cage when the place was destroyed by the Orb, licking the Collector's face in the post-credits scene with Howard the Duck, and you can certainly expect him to play a bigger part in the sequel. You see, that dog was Cosmo - a Russian space dog with telepathic powers from the comic books, the security chief on Knowhere and, importantly, who has been a full-blown member of the Guardians Of TheGalaxy. Now that he's been released from his captivity, he will surely be more prominent as a character in Guardians Of The Galaxy 2.