Little Fawn's Salt Lick

Little Fawn's Salt Lick teaches you how to summon a Little Fawn.

Source
This item is obtained when you complete the achievement. This requires you to have learned 75 different kind of companions.

Pet Journal
"She likes the company of friends. Seventy-five of them, to be precise."

Trivia

 * The "Lil' Game Hunter" achievement name is probably a reference to the «» who is a person who likes hunting large animals for parts as trophies.