Green’s Dictionary of Slang

(US teen) a young man or woman who enjoys partying; one’s boyfriend or girlfriend.

1922		Appleton Post-Crescent (WI) 12 May 11/1: Flapper Dictionary snuggle puppy – A Flapper or Flipper who is over-sentimental.
1922		Edwardsville Intelligencer (IL) 14 Sept. 4/4: The Flappers’ Dictionary [...] Snugglepup: A young man who attends petting parties.
1935		A.J. Pollock Und. Speaks n.p.: Snuggle puppy, girl who enjoys a good time.
1954		(con. 1940s) T.A.G. Hungerford Sowers of the Wind 31: ‘Hullo! [...] Cuddle pot and Snuggle pie! Where have you brave warriors been?’ It was Salom, and he came up and stood beside their bed.
1966		Trimble 5000 Adult Sex Words and Phrases.