Depends what the particular smell is, in some cases if downed meat is used there can be a smell mask put through the meat and yes downed meat may be cheaper. However there is no particular downfall to the use of downed meat to feed a dog, once again this would come back to in the wild a dog may scavenge for food and will eat what is available at the time, due to this a dogs stomach is extremely effective at killing bacteria.
Also with your reference to cheap, what would you consider cheap pet meat? and what type of meat is it? is it always fresh or does it come frozen?

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