I've seen much more evidence that animals such as dogs and cats have a conscious perception that is (somewhat) similar to ours (in regard to emotions, cognitive ability, etc), in ways that many people either disregard or are not aware of, than that they do not.
So far, in this discussion, I haven't seen very much evidence for the claim that they do not, besides a few anecdotes and the "skeptical" view of "Well those that the display those traits are in the minority (though I'd still like to see a source for that claim)"
So, to try to draw some out, here are a few (permissible, in my opinion) works that work to support the theory that they do.
Thus, throughout the nineteenth century naturalists debated the rival claims of dogs and apes to be top animal, and therefore closest to humankind. In 1881, for example, George J. Romanes, a close friend of Darwin's with a special interest in animal behavior, celebrated the "high intelligence" and "gregarious instincts" of the dog, which, he argued, gave it a more "massive as well as more complex" psychology than any member of the monkey family. (G. Romanes, 1896, p. 439) Two years later Romanes revised his ranking slightly, including both dogs and apes on level twenty-eight of his famous fifty-step ladder of intellectual development. Level twenty-eight was characterized by "indefinite morality" along with the capacity to experience shame, remorse, deceit, and the ludicrous. (To give some sense of the scale: steps twenty-nine through fifty were reserved for human beings, while worms and insect larva occupied step eighteen because they possessed primary instincts and could feel the emotions of surprise and fear.) Although this schema gaves apes and dogs equivalent rank, Romanes was far from thinking that they possessed identical mental attributes. Rather the ape had achieved its high status through intellect, the dog on account of highly developed emotions. (G. Romanes, 1883, p. 352, inset)
http://findarticles.com/p/articles/m..._n8910569/pg_3
Research suggests that animals can experience negative emotions in a similar manner to people, including the equivalent of certain chronic and acute psychological conditions. The classic experiment for this was Martin Seligman's foundational experiments and theory of learned helplessness at the University of Pennsylvania in 1965, as an extension of his interest in depression:
A dog that had earlier been repeatedly conditioned to associate a sound with electric shocks did not try to escape the electric shocks after the warning was presented, even though all the dog would have had to do is jump over a low divider within ten seconds, more than enough time to respond. The dog didn't even try to avoid the "aversive stimulus"; it had previously "learned" that nothing it did mattered. A follow-up experiment involved three dogs affixed in harnesses included one that received shocks of identical intensity and duration to the others, but the lever which would otherwise have allowed the dog a degree of control was left disconnected and didn't do anything. The first two dogs quickly recovered from the experience, but the third dog suffered chronic symptoms of clinical depression as a result of this perceived helplessness.
A further series of experiments showed that (similar to humans) under conditions of long term intense psychological stress, around 1/3 of dogs do not develop learned helplessness or long term depression. Instead these animals somehow managed to find a way to handle the unpleasant situation in spite of their past experience. The corresponding characteristic in humans has been found to correlate highly with an explanatory style and optimistic attitude and lower levels of emotional rigidity regarding expectations, that views the situation as other than personal, pervasive, or permanent. Such studies highlighted similar distinctions between people who adapt and those who break down, under long term psychological pressure, which were conducted in the 1950s in the realm of brainwashing.
Since this time, symptoms analogous to clinical depression, neurosis and other psychological conditions have been in general accepted as being within the scope of animal emotion as well.
http://en.wikipedia.org/wiki/Emotion_in_animals
References listed on site.
Washington Post: What were they thinking? More than we thought
Charles Darwin's "The Expression of the Emotions in Man and Animals"
Comparison of the Mental Powers of Man and the Lower Animals, by Charles Darwin
To keep it balanced, I have included another study that says that animals that pass what is called the "mirror test" and are able to recognize themselves, in a mirror, are more likely to express empathy. The (single) study states that dogs do not pass this test.
Link
Howie (and those that share his position), if you argue that they do not exhibit these traits, please provide some more research that supports that position. Study into the behavior of animals has been going on for a long time, and opinions do vary, as much as I've seen, so I'm sure you'll be able to find some to bring to the table.
Personally, I think the main flaw in equating animal-to-human "emotions" is that most people tend to try to relate them too strictly. They are looking at "what animals should do when x is a factor" in the same light as "what a human would do when x is a factor." The two responses would, more than likely, be different, and it is this disconnect (coupled with the fact that animals can't directly talk to us) that cause most humans to feel that we are much further apart, cognitively, than we really may be.
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