MacKenzie, a 4-pound Chihuahua, has won the title of "The country's most heroic canine" at the American Humane Hero Dog Awards. Despite being born with a cleft palate, MacKenzie has dedicated her life to nurturing baby rescue animals with birth defects and teaching children to be open-minded towards animals and people with physical differences. She works with The Mia Foundation, a non-profit organization that rescues animals with birth defects. MacKenzie acts as a mentor and mother figure to these animals, providing love, care, and teaching them important skills. She has become an inspiration to many and has been recognized for her incredible work.