Rupert the pit bull stands at the feet of his 2-year-old owner, calmly snorting up popcorn while the toddler yanks forcefully at the dog’s collar. Tai Wickline is pulling hard enough to elicit bulldog-like breathing from his 3-year-old canine. “You trying to pull Rupie up the stairs?” coos his mother, Amanda Shippee, from the kitchen. […]

