"Ohgahd! Heww! Yukk! Uhhg!"
That's a direct quote.
My wife got out the bowl of dog kibble from the cupboard and uttered some improvised phonemes of surprise and disgust.
"What did I do wrong?" I asked, since this question often saves a lot of time.
"There's a dead mouse in the dog food."
Ah. Well, better than a live one. A dead mouse can be thrown over the fence into the front yard, where Nature Will Take Its Course.
I have hurled any number of expired fauna over the fence, and they are always gone in a day or two. I've yet to see a buzzard carry off a frozen squirrel, but they probably work at night.
A live mouse has to be caught and released, so you can tell yourself it's heading off to a cozy burrow out of a Beatrix Potter illustration, where it will put on clothes and have tea and not spread plague.