noun

• (countable, childish or endearing) A dog, especially a small one.
  "That's such a cute little doggy, Keira!"
• (countable, military, 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 […]"
• (mining, historical) Synonym of corporal.
  "[…] the "doggy" sometimes took a safety-lamp, and sometimes not, when he entered the mine in the morning; whether he did on the morning of the catastrophe was not apparent."
• (uncountable, sex) Ellipsis of doggy style.
  "Her favourite position is doggy."

adj

• (slang, of sexual intercourse) Doggy style.

adv

• (slang, of sexual intercourse) Doggy style.

adj

• (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."
• (informal) Fond of dogs.