A 6-year-old border collie, rescued during COVID-19, is at the heart of its owner’s new children’s book series designed to help children process feelings, build confidence and feel understood. Children’s book author Johanna Johnston of Houlton and Rex, one of her five dogs, are a certified pet therapy team. Their visits to Aroostook County schools inspired the “Rex to the Rescue” stories. As Johnston and Rex volunteered, starting out with first …