Guys, the 'dog' isn't going to be like the mabari. It's going to be an on ship pet. It's a flippant touch of whimsy, not a combat option.
Bioware said:
Robotic Dog ? A faithful sidekick to keep you company on board the Normandy.
--Source [http://masseffect.bioware.com/me3/game/order/]
Now, it's up to you to decide if that's enough to entice you. I'm uns... oh, who am I kidding? Yes, it is enough for me. Especially if you can play with him.
But it's not a copy of DA2. Let's not bash them for stuff that doesn't seem likely.