Abstract: Proposed is an electrocardiogram monitoring device for pets such as dogs and cats, the device including a pad that a pet climbs on a plurality of electrode bodies that are dispersedly disposed on an upper surface of the pad, and of which top portions are exposed, an electrode differentiation unit configured to select electrode bodies that are in contact with paw pads of the pet and that will receive electrical signals for electrocardiogram, and an electrocardiogram measurement unit configured to receive the electrical signals from the electrode bodies selected by the electrode differentiation unit and perform the electrocardiogram.