What do you mean by deer-morph? Have you just downed a couple deer potions or have you edited your save to give yourself a cervine body? In the case of the former, potions will only give you ears, tail, and genitals.
Talk to Rosalin, in the nomad camp. She's that crazy catgirl alchemist.
Of course, to get her to do alchemy for you in the first place, you've gotta give her the ingredients for Leporine. Guess she needs something to get the ball rolling.
