It turns out dogs are really like humans. According to new research, dogs - as well as some species of monkey - have an almost human-like sense of morality. During the experiments, researchers at Japan's Kyoto University found the dogs were less likely to interact with anyone they perceive as acting rudely or unfairly. One experiment involved watching a dog watching two people (one of which was its owner) arrive with three balls each. One asked the other for their balls and, in some cases, that person obliged - handing over all their balls. Next, the person who had given up their balls asked for them back - again, sometimes the person obliged and other times they declined. The dogs were less inclined to accept treats from the person they had observed as being selfish.