Mackey is a throat cancer survivor .
Throat cancer survivor 's been losing throat cancer survivor 's 's teeth in the last year , including one that fell throat cancer survivor Mackey he ate a piece of fudge during last year 's Iditarod .
Mackey is a throat cancer survivor and he 's been losing his teeth in the last year , including one that fell out when he ate a piece of fudge during last year 's Iditarod .