Lassie

Lassie is Ben's new dog in Ben 10: Ultimate Omniverse. Credit goes to Startreknerd11011011 for making original idea.

Backstory
Not much is known about its early life, all that is known is that it was found by Azmuth when it was just a pup. It was in a fight with a Lucubra and got badly wounded. It was a  Lucubra that Azmuth found after it got amnesia with its fight with the Vulpimancer, he managed to convince it that it was an Anubian Baskkurr. He also managed to give it a Psy-Virus, meaning that when it meets Daigon, and it links minds with him, it will transfer over the virus, this virus will severely weak Daigon so that Ben can defeat him. the Psy-Virus would also effect Lassie, making it remember nothing about being a Lucubra, so it will still be the same old dog as before.

Skills
Fetch, Sit, Roll-over, play dead, and Sic-'em.

Omnitrix
Lassie has  a smaller form of Omnitrix that is attached to its neck on the celular level, cannot be removed without killing it. This mini-omnitrix allows it to take the form of a Golden-Retriever when undercover and transforms back to its Alien form when Ben presses a button on his own Omnitrix, so it can help him in fights.