Illustrated Companion to the Latin Dictionary/Catenarius

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

CATENA'RIUS, sc. CANIS. A yard or watch dog, chained up to protect the premises from strangers. The Romans kept dogs in this way at the entrance of their houses by the side of the porter's cell, with the notice, CAVE CANEM  — "Beware of the dog," written up (Pet. Sat. 19. 1. Id. 72. 7. Seneca, Ira, 3. 37.); as is shown in the annexed illustration (Catenarius/1.1), from a mosaic, which forms the pavement of the prothyrum in the house of the "tragic poet," as it is called, at Pompeii.

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  Catenarius/1.1