Deer are put together the same as most mammals, practice on rabbits, squirrels, ect.
The most important thing is that you DO NOT let the bullet go thru any part of the abdominal cavity when you shoot the animal.
If you shoot the animal in the heart/lungs (chest cavity, ABOVE the diaphram) field dressing is clean and easy.
If the animal is "gutshot" your job is a mess.