An animal emotion display system 100 including: a transmitter 10 which is attached to an animal and a receiver 20 which is capable of communicating with the transmitter, wherein the transmitter 10 includes: a tail wagging detection sensor 12 to detect a plurality of kinds of tail wagging of the animal as a plurality of kinds of emotion of the animal, respectively and a transmitting section 15 to transmit emotion data corresponding to the respective kinds of tail wagging detected by the tail wagging detection sensor 12 to the receiver 20, and the receiver 20 includes: a receiving section 22 to receive the emotion data transmitted by the transmitting section 15 a display section 25 and a display control section 24 to display a display content corresponding to the emotion data received by the receiving section 22 on the display section 25.
