LATIN DICTIONARYLexicon Latīnum
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“house-dog” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

house-dog
canis domesticus, or *canis tecti, aedium, etc., custos (as guard; custos, of dogs, Verg., 3, 406; Col., 7, 12): catenarius canis (as chained up, Petronius, Sat., 72, 7; Sen., De Ir., 3, 37).

Quick answer

What is the Latin word for house-dog?
The usual Latin words for “house-dog” are aedis, custōs, Petrōnius. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.