I'd be suspicious of any "study" that purports to measure pain in animals.Cats and dogs are very alert to stimuli visually, and aurally. Why should they not feel pain to the same degree?

For a while I gave daily injections of antibiotic to a one-and-one-half inch turtle, with possibly the world's smallest hypodermic. Her reactions to this process were quick and frantic. I don't doubt reptiles feel pain!

There is a tendency among humans to elevate themselves above animals in all ways--including neurologically, it seems...