She often shows extreme anger/frustration with me by giving me the dirtiest looks when I bother her. People laugh when I say my dog is giving me those looks, that is, until they actually see her do it.
She also experiences joy when she sees me get out a new fleece blanket. For a furry dog that gets hot, it's strange, but she absolutely loves fleece. Her eyes get huge, her body posture changes, she runs to the blanket, and then she sighs.
She also shows remorse. If my mom's dog is bothering her, she normally snarls, growls, and shows her teeth. She has never intentionally bitten him (which is surprising, becuase she has intentionally bit ME and other people several times and he bothers the crap out of her). A couple times she must have accidentally nipped him and he squealed. She stopped snarling immediately, ran over to him, and stuck her nose in his face until she knew that he was okay.
I would say that people who don't think animals have emotions either do not spend much time around animals or they don't want to feel guilt when they do something "not so nice" to animals.