Filling my tag with someone else's deer

First of all, thanks for the taking the time to ask the question.  Putting your tag on an animal you did not harvest yourself is called a tag transfer and is illegal.  The person to whom the tag is issued is the only person who may attempt to harvest that animal.  It is legal however for someone to legally harvest an animal and give the animal to other person.  Anytime an animal or parts of a legally harvested animal are given as gifts, they must be accompanied by a proxy statement.  Their is a sample proxy statement on page 102 of the 2014 Big Game Rules.