CHARLOTTE, N.C. — The first time 11-year-old Levi McAllister had a tooth pulled, he screamed, kicked and struggled so much that his mom had to hold him down. So when Levi returned to Charlotte Pediatric Dentistry in January to get two more teeth pulled, dental hygienist Barb Kucera had a surprise for him: a friendly yellow Labrador retriever named Atkins.