People that have the dog after the fact can feed them whatever they prefer I believe.
You sure about that? I seem to recall there being a big stink about just this with several of the larger service dog organizations (Delta comes to mind), that strictly prohibited the feeding of raw to any dogs involved in the program. Now, I can't remember if that only applied to the therapy dogs, and I don't know how they could possibly police dogs that had already been placed, but they're large enough that when they make a stink about something like that... people listen. And when they come out stating anti-raw sentiments, plugging Pro Plan til they're blue in the face, what's one to think?
I get that companies like Purina fund a lot of these things, I have no issue with that. Yay for them actually doing something productive with all that money they save by sourcing crap ingredients for their foods.
But the venom towards anything else OTHER than the almighty Pro Plan. Its sad.
Kirkland is available only at Costco as it's costco's house brand, and costco is not readily available in many areas. National service dog agencies typically feed a food EASILY obtainable by pretty much anyone anywhere in the country. Pro plan, eukanuba, science diet, etc are all available at every petstore in the country. Around here diamond naturals is only available at TSC - TSC isn't as common as petsmart, petco, wal-mart, target, etc.
I'll give you this, but lets look at it from a different angle.
Brands like Pro Plan are also not available at Walmart. If one were to want Eukanuba or Pro Plan, they would have to go to a pet specialty store. Pet Supplies Plus, a fairly common store, carries Diamond Naturals, as well as brands like Chicken Soup and Whole Earth Farms. Petco now carries Merick, so they too have WEF. All of the listed are very affordable, good foods (30lb bag of CS is around $35, 34lb bag of WEF I've seen for as low as $35). They also carry brands like Organix, Avoderm, and Nature's Recipe, which while not QUITE as cheap as Pro Plan, are still affordable and available. Not to mention that very basic rule in feeding a quality kibble- the better the food, the less you feed. So honestly, feeding a dog Organix probably comes out to being around the same as feeding Pro Plan, minus all the "junk". So if they can afford that, why NOT something better?