Us humans have enough love to go around, but for some reason our pets can’t seem to understand it, especially dogs. A recent study has shown that dogs do get jealous not only on other humans that interact with the owner, but on each other too. Nowhere is this more obvious than in the video below. In it, a Great Dane gets extremely jealous when his human starts petting another dog, although that dog is his own brother. He starts by growling at him, but as the owner continues to tease him, everything turns into a full-blown tantrum. Hilarious!