Ins. agents have been known to tell the vehicle owner that it's okay to wash the car. The adjuster gets there and doesn't see blood, guts or hair. Unless you can prove it, he will probably write the damage off to a non-animal accident, which will be YOUR fault, and they will raise your insurance premiums. Nice, eh?
And that would be about the time I’d hand the guy a trash bag full of entrails and say, “Here’s your proof… and your dinner!”