I was looking at
this and felt like something was out of place. You know, you've got weapons and appearance packs, art book, OST, comic book, etc., and all of this sounds actually pretty cool... until you get to the dog part. First things first. Is it me or this sounds awfully similar to DA2's dog summon that came with The Black Emporium DLC?
With that out of the way comes question number two: do we actually need a dog? Does it make sense that in the middle of a war with the Reapers Shepard will have time to: a) build or procure the FENRIS mech somehow; and

actually use it (unless it works the same way as DA2 and you can use it as a third companion). Something more along the lines of 343 Guilty Spark could be less obtrusive and more useful (it can fly!). Equip it with the oculus' laser tech (probably a downgraded version to keep it small) and you're good to go. What's more, you could even use it as a terminal to check messages, configure squad, etc., etc.
It's just that the word "dog" in a sci-fi game seems... odd, whether it's robotic or not. Just my two cents.