Here are some interesting studies I found on the subject since my assumption that it was an obvious truth didn't cut it. Should have started out this way, just didn't predict the opposition. So here ya go...the scientific method! Check it out

Animal Emotions Provide Clues to Autism, Other Disorders-

http://researchnews.wsu.edu/health/141.html

"Do animals have emotions?
Look deep into her eyes ... Is she sad or do we just think so? Many scientists now believe that animals feel emotions too"-

http://www.timesonline.co.uk/tol/news/world/europe/article4595810.ece

Study Says Dogs Read Human Emotions on Faces-

http://petcare.suite101.com/article.cfm/study_says_dogs_detect_emotions_on_human_faces

"Researchers working in neurobiology and behavioral observation seem to be learning what pet lovers have known all along: animals have feelings."

"New evidence gathered from actually studying dogs, chimps and other animals, supports pet owners’ firm convictions that animals experience fear, jealousy, grief and love."


http://www.buzzle.com/editorials/8-10-2003-44071.asp

"Five years ago my colleagues would have thought I was off my rocker," said biologist Marc Bekoff. "But now scientists are finally starting to talk about animal emotions in public. It’s like they’re coming out of the closet."