I agree with all above comments about MRE. I think they are more salty than mountain house. I stay away from saltier items though. You'd also be packing so much MRE trash out.
I have some MRE in my coat closet for the times that my kitchen sink is so full that making Ramen is out of the question. I also keep a couple in the office cabinet in case I'm too busy for lunch.
Grabbing a couple of MREs and no stove for a last minute trip is a great idea since it shortens trip preparation time.
Wouldn't canned beans suffice? Or does dog food not freeze?