i think your buddy just made some sausage out of bambi...

but hey, that is the best damn meat you can get.
here is my suggestion: go rent tommy boy, and watch the part where they put the deer that they hit into their car. Take careful note as to what the deer does as they are driving down the road. That should give you a good reason not to put deer in your car. Deer have very sharp hoves, by the way, and they will try to use them if they have no other choice. I don't know about bambi, but a full grown deer can kill you. Seariously.
No offense, but what you did was really dumb. If you hit a deer, you should not even attempt to approach it, because if it wakes up, and you are standing there, you could potentialy get hurt.