Wiktionary
put on the dog
alt. (context colloquial dated English) To dress up; to put on airs; to make a show of wealth and/or importance; to be pretentious. (from 19th c.) vb. (context colloquial dated English) To dress up; to put on airs; to make a show of wealth and/or importance; to be pretentious. (from 19th c.)