Ur(i)dimmu, meaning "Mad/howling Dog" or Langdon's "Gruesome Hound", (Sumerian: ð¨ð Â<small>UR.IDIM</small> and già ¡.pirig.gal = ur-gu-lu-ú = ur-idim-[mu] in the lexical series <small>ḪAR</small>.gud = imrû = ballu), was an ancient Mesopotamian mythical creature in the form of a human headed dog-man whose first appearance might be during the Kassite period, if the Agum-Kakrime Inscription proves to be a copy of a genuine period piece. He is pictured standing upright, wearing a horned tiara and holding a staff with an uskaru, or lunar crescent, at the tip. The lexical series ḪAR-ra=ḫubullu describes him as a kalbu à ¡egû, "rabid dog".
His appearance was essentially the opposite, or complement of that of Ugallu, with a human head replacing that of an animal and an animal's body replacing that of a human. He appears in later iconography paired with Kusarikku, "Bull-Man", a similar anthropomorphic character, as attendants to the god à  amaà ¡. He is carved as a guardian figure on a doorway in Aà ¡à ¡ur-bÃÂni-apli's north palace at Nineveh. He appears as an intercessor with Marduk and Zarpanëtu for the sick in rituals. He was especially revered in the Eanna in Uruk during the neo-Babylonian period where he seems to have taken on a cultic role, where the latest attestation was in the 29th year of Darius I.
As one of the eleven spawn of Tiamat in the Enûma Elià ¡ vanquished by Marduk, he was displayed as a trophy on doorways to ward off evil and later became an apotropaic figurine buried in buildings for a similar purpose. He became identified as <small>MUL-</small> or <sup>d</sup><small>UR.IDIM</small> with the constellation known by the Greeks as Wolf (Lupus).