Dean,
At first thought it would seem like a good diet to give dogs only meat, because in the wild dogs eat animals they have hunted.
Actually, if you observe dogs in the wild you will see that when they kill their prey, they tear into the gut and first consume the nutrient rich organs and the intestines. Keep in mind that the intestines contain the partially digested grasses, seeds and leaves that the prey recently ate. the rest of the carcass is usually left for scavangers to finish off.
Considering this, we can see that vegetables and nutrient dense proteins play an important part in their diet.
I don't know if your friend feeds their dogs the meat raw or cooked. I would be careful giving cheap meats to them uncooked because of the risk of parasites and other things. grass fed organic meat would be great, but who could afford that?
There are instructions online about feeding your pets a raw diet. It would be a great diet except for the cost and prep time.
There is one other thing I do to supplement my dogs diet. I hesitated to share this because I feared the response I might get. Whenever I have chicken or turkey bones left over I simmer them with vegis for three days. By then many of the minerals from the bones and cartillage have leached out into the broth that I use for a very nutritious soup. The leftover bones have softened up so that you can crush them with your fingers. I feed them to my dog along with the meat scraps and vegis from the pot. they also get the organs raw from the chickens when I butcher them.
Marlee, this only saves me money because I have a garden and chickens. Your situation may be different. Do the best you can. Hopefully others will share ways they save money. I'd love to find more ways to save.