Abstract: A pet house formed of multiple pet house units detachably fastened to one another through a plug joint, each pet house unit being formed of a house and an ornamental storage item secured to the inside of the house with hook and loop materials, the house having a body with window openings, ornamental plate members detachably coupled to the window openings, a rood covering the body, a LED mounted inside the roof, and a switch for switching on/off the LED.