pup, young dog; adult dog (in Brazilian Portuguese only)
Origin uncertain, possibly < VLat. *cattŭlus < Lat. catulus 'young animal, kitten, pup' (WH). In Brazil, this form has replaced 'cão' with reference to the adult dog. This shift is a consequence of a tabooistic semantic change: o Cão = 'the Devil' (DH).
Robert Farren, PIE culture words collection, 2017
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