I've a 7-month old Beagle who also works as a service dog, so I've invested a good amount of money on her procurement and training. With that in mind, recently I realized that with a few exceptions, I can follow the MMM "paleo" model with both of our diets.
This weekend I made a paleo fried rice (diced cauliflower instead of rice) with green beans, carrots, peas and eggs (or powdered egg white, cheaper!). Today for lunch, I ate 80% of my plate and Beagle ate the rest. She loves canned carrots, green beans and peas (we're still working through the list to see what else she likes) so when they're buy 2 cans, get three cans 3, I buy up cans and use healthier frozen/organic veg for my meals which I can share with her if I forget to pack her lunch. She also gets meats -- again when there's a BOGO sale on whole chicken, pork chops, etc., it's a good opportunity for me to buy some healthy, cheap groceries that my Beagle can also consume. (Also, more efficient to buy for one meal plan!)