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There isn't much of a difference between a dog and a two-year toddler, according to new research. Both are on the "same mental plane," according to a psychology professor and dog expert who reports that like two-year-olds, "dogs can experience fear, anger, happiness and disgust, but not guilt." (Humans don't experience guilt until the age of four or so.) Regrettably, the study did not look into cases in which the parents were operating on the same mental plane as the toddler and dog, but we'll assume the results of that study will be coming along any day now. [Yahoo! News]