Blood doesn't just come out of the mouth for no reason. Just like humans who bit thier tongue (only analogy I can think of). Was it a lot of blood or a little?
If you still have him and put him in a fridge, you can have an animal necropsy done. It's basically an autopsy. Animal has to be refrigerated pretty fast though. Cost about 100.00. I would love to know the reason. Sorry for your loss.
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