Does animal behavior include feelings? Do dogs, cats, chimpanzees, and other animals feel emotions such as happiness or sadness? Dogs make a sound like laughter. And animals form relationships with other animals similar to human bonds. We can see this in experiments. For example, researchers wanted to assess if chimps could make stone knives very well. They tested a brother and sister pair of chimps. When Panbanisha, the sister, could not make the knife, she felt disappointed . Her brother Kanzi felt sad too and tried to help her.