English and the Austronesian language Mbarbaram both use the word dog for canines  These two languages are unrelated, and since speakers of the two languages only came in contact with one another long after the word dog was first used in this way in either language, neither language could have borrowed the word from the other
Thus this case shows that sometimes when languages share words that are similar in sound and meaning the similarity is due neither to language relatedness nor to borrowing
English and Mbarbaram share no words other than dog. 