doggy

Etymology 1

From dog + -y (diminutive suffix).

noun

1. (childish or endearing) A dog, especially a small one.
   That's such a cute little doggy, Keira!
   "Come on now, there's a good doggie!" 1946, George Johnston, Skyscrapers in the Mist, page 33
2. Doggy style.
   Her favourite position is doggy.
3. (armed services, UK, informal) A junior temporarily assigned to do minor duties for a senior; a gofer.
   The Torpedo Officer and I were on the lower bridge and we each had a doggy, a young midshipman […] 2008, Iain Ballantyne, HMS Rodney: The Famous Ships of the Royal Navy Series

adj

1. (slang, of sexual intercourse) Doggy style.

adv

1. (slang, of sexual intercourse) Doggy style.

Etymology 2

From Middle English doggi, equivalent to dog + -y (adjectival suffix).

adj

1. (informal) Suggestive of or in the manner of a dog.
   King Lune […] had just come from making a round of the kennels with his Huntsman and had only stopped for a moment to wash his doggy hands. 1954, C. S. Lewis, The Horse and His Boy
   The house wore the startled doggy air of having been undeservedly rebuked. I knew the feeling. 1993, John Banville, Ghosts
2. (informal) Fond of dogs.