How does the pain our pets feel compare to the pain we feel?

This is a good article describing both the difficulty we have in assessing our patients' pain AND the behaviors we use to determine when a patient is in discomfort.

From the Toledo Blade, "Pets experience pain much like humans."

I think this comes across clearly in the article, but the biggest difference between pain in humans and pain in animals is the degree to which that pain is evident to an observer. Dogs and cats (ESPECIALLY cats) are unbelievably good at hiding their discomfort, so much so that even the people who know these animals best have difficulty determining whether or not their pets are in pain.