Lewis & Short

lātrātor, ōris, m. [1. latro], a barker (perh. not ante-Aug.).

  1. I. Lit., poet. for a dog: Molossi, Mart. 12, 1: Anubis (who is represented with the head of a dog), Verg. A. 8, 698; Ov. M. 9, 690.
  2. II. Transf., a bawler, brawler: a viro bono in rabulam latratoremque converti, Quint. 12, 9, 12.