Researchers claim to have found a basic form of jealousy in dogs (but do you know how to interpret your dog’s tail wags so you can figure out if YOUR dog has this problem?) Before this, they thought that only primates (that’s us!) were able to feel that emotion.

The researchers came to this conclusion because they discovered that a dog will stop doing a simple trick (in this case, extending his paw to “shake hands”) when he’s not rewarded if he sees another dog being rewarded for doing the same task.

BBC News quotes neurobiologist Frederike Range as saying, “[If] the only difference is one gets food and the other doesn’t, they are responding to being unequally rewarded.”

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