Cute picture! How did M react to this intrusion?
Mocha didn't note the visit by sound or sight even though they were clearly visible to her. She was "all raised fur" in the morning, however, when she went out the back door. When Z&M first realized bears occasionally came into their space in the spring, they were bent out of shape as expected. But, as they got older, they ignored (or, less likely, failed to note) such visits - perhaps aware that messing with a bear was likely to be messy!
Sassy generally likes to chase them, pretty proud of herself when they run away. I hope she doesn't catch one.
Vet bills are on a par with fancy cars, boats and our own health care costs....
M&Z did learn to back off from porcupines. I never needed a vet for the initial quills but there was a belated neck abscess that cost as much as a cheap car:-).