I need to know if it's acceptable to feed my snakes a mouse or a rat that has died of an unknown cause? I ask this because I found a rodent breeder locally and when I asked how the frozen mice/rats were euthanized he said 'Most' are done in a CO2 chamber, but occasionally when pups and pinkies die from natural causes he freezes them too. When I asked about the larger mice and rats he said that when they die from overcrowding or other unknown causes he uses them for his customers too. From his POV a rat is a rat, whether it dies from CO2 or a natural cause shouldn't matter.

But my main concern is healthy food, will my snakes get sick from eating a rat or mouse that had died from something, like being sick?