Yen, I feel like your question is still just hangin' out there, blowin' in the breeze. I don't feed prey model (I feed pre-made raw), but I can try to list some potential risks of raw (and maybe others can add to this)
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-Choking hazard potential w/ Prey-model; despite the fact that dogs should theoretically be able to properly chew raw meaty bones, the fact is that any object whatsoever that could possibly occlude the throat (chewed or whole) is a potential choking hazard
-Intestinal issue/blockage after consumption of bones; while this is rare, it has been reported and is very dangerous if it does happen. In the wild, many wolves consume their bones along with some fur and there is some thought out there that the fur helps protect the digestive tract. IMO, this isn't really the full story though -- the distinct lining of the digestive tract in dogs/wolves is designed to handle raw bones and shouldn't need fur for bones to pass. So anyway, while very rare, it's a potential risk.
-Balanced diet. I don't necessarily agree that a prey model diet is UNbalanced. However, saying it is balanced is really an assumption that is based upon the wolf. While it may indeed be balanced, I'm not sure there is verifiable proof at this time. If there is someday, FABS! This is where I feel more secure feeding pre-made...but you make sacrifices there too, if you believe in raw (in general, that is). I just prefer the sacrifices of pre-made vs the possibility of choking hazard. If my dogs were more similar in size to a wolf or coyote, I may feel differently.
-Germs. An immunosuppressed dog will always be more vulnerable to germs, no matter the food. With raw, there is a potential for more germs. I've been feeding raw for almost 3yrs now, and we've never had any problems w/ germs.
-Feces. From what I understand, all dogs have salmonella in their feces - no matter what the diet. Raw-fed dogs may have a higher concentration of salmonella in their poo. However, no one can tell me if this translates to an increased risk or not. Regardless, I will handle poop the same I've always handled poop
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What else? I really dunno...that is just off the top of my head, but I will keep thinking about it...