Green’s Dictionary of Slang

fashionable, esp. when showy, over-ornate.

1885		Puck (N.Y.) 29 July 343: Oh, that’s just too doggy for anything.
1897		Bookman Aug. 448: Twenty years ago the college man had a most picturesque vocabulary. What color there was in such words as ‘doggy’ [W&F].
1902		Bulletin (Sydney) 11 Oct. 13/2: When ‘Universitas Sydnienis’ happened along there was always a cheer, and ‘Excellentissimum’ (a very ‘doggy’ word, by the way) was always the signal for general applause whenever it occured.
1915		R. Bolwell ‘College Sl. Words And Phrases’ in DN IV:iii 233: doggy, adj. Dressy; neat; handsome.
1923		O.O. McIntyre New York Day by Day 22 May [synd. col.] Two ladies in doggy evening wraps stepped on the elevator.
1935		(con. 1920s) J.T. Farrell Judgement Day in Studs Lonigan (1936) 482: He saw that they were wearing smart and expensive clothes [...] Doggy fellows, he mumured to himself.
1945		C.M. Webster Town Meeting Country 180: It was no doggy place with tables [DA].
1965		T.B. Haber ‘Canine Terms Applied to Human Beings’ in AS XL :2 95: doggy. First-rate, fashionable.