The Total Tree Transplant

Our neighbor had a tree that a local squirrel had planted right up next to their house.  Obviously, it could not live there for long.  So we hatched a plan to remove it from behind their house and move it to a spot in our yard.  We executed the plan to near perfection, but it appears after 5 or 6 days now, that the tree is not happy in it's new environment.  Day 2, it looked great when responding to it's watering and full day of sunlight, but we're on day 5 or 6 now and it's wilting pretty bad...  *sigh*