Ok -- you asked and I'll tell you. Monica's actually a good friend of mine and I've known her for years. I've used her diets MANY times.
However ...
They can be intimidating. Let me just say this. You feed yourself don't you? Have you died from malnutrition yet? Probably not.
Home cooking can be very complicated and daunting -- don't let it be. I don't use a recipe. I know the basics and things to watch for. But for me, I essentially let variety balance things. I vary meat sources, I vary veggies, I vary oils, I vary Omega 3's -- I even vary calcium.
Why? cos it works. Roughly I do a diet that's about 30 - 35% meat and the rest is veggie. Some weeks I add grain (if someone's tummy has been upset because the food's maybe been too 'rich' I might add grain, or maybe it wound up being a little too 'wet' this week so I added some barley or rice to thicken it.).
Most weeks I do 3-6 veggies.
I don't have a freezer. I don't have a big fridge. I live in Flooor-daaa so I don't use my oven (I don't make meatloaf for ME much less the dogs LOL). I cook my dogfood in a tabletop roaster (which is a faster version of a slow-cooker essentially). I cook the hard veggies first (I just bought myself a food processor a month ago -- been cooking dog food without one for about 35 years now). Squash, kale, sweet taters, cabbage, and/or crunchy stuff.
I scoop out the cooked veg with a seive and plop it in a dishpan (one I use for this every week). I toss in the next veggies (things not as hard, things that don't require so much cooking -- often frozen veggies like turnip greens, okra, etc.)
While that cooks I mash up the first bunch with a potato masher. Usually I add a can of diced tomato, and if I"m short on squash/orange veggies I add a can of solid pack pumpkin -- usually put my calcium in while I"m mushing up veggies. I use a store bought calcium powder.
The meat gets cooked last or next to last. Usually I'm lazy and buy it ground. I might buy heart or liver and cut that up in cubes (I do organ meat once a month if possible). Don't overcook the meat. Like I said, if it's really soupy I add barley (yes, I use quick cook barley or oats -- I work and I gotta survive).
I just keep adding the last cooked thing and mush it with the potato masher. When it's all cool I put it in containers. Generally I cook once a week. That's the goal. I don't cook for David and I most evenings -- I can't cook dogfood mid-week without it being a major hassle.
But that's as scientific as it gets.
You feed yourself. You can add some supplements if you need/want to. You read up on "calcium/phosphorous ratio". You experiement with veggies you have perhaps never eaten in YOUR life.
I'd never had kale in my life til I cooked it for the dogs. The only 'canned' thing I use is tomato -- because I don't want the salt that's in canned veggies.
You learn as you go. Don't expect to know it all the first week -- but they'll be happy with whatever you do. Trust me. One week that isn't 'balanced? Don't stress it -- you'll make much up if you vary everything widely.
I grew up in a home where Sunday was chicken, mashed potatos and corn. Monday? Meatloaf, baked potato and peas. Tuesday? Smoked pork chops, mashed potato and ... corn. Wednesday? Steak, baked potato and peas. Thursday was leftovers and peas and corn.
Friday was "grocery day" -- so it was usually something unusual.
Saturday was hamburgers or steak, baked potato and ... maybe chef salad (and that was lettuce and a sliced up tomato and carrot pennies). whoo hooo!!
Week in and week out. I thot vegetables were represented in Merriam Webster by a picture of an ear of corn and a bowl of peas.
It was what my Dad liked. I *thot* that was veggies.
I had a lot to learn ... and honestly? I still hate cooked carrots! LOL