Last Christmas morning, I patted my bed, inviting my newly adopted beagle, Bonnie, to jump up and cuddle. My boyfriend, still under the covers, reached out to pet her soft little head, which was now wedged between us. I turned away to grab my phone, and it happened: a guttural bark, followed by a human scream. I whipped around to see my boyfriend’s hand covered in blood. Before I could figure out how to help him, he was out the door on his way to urgent care. It was Bonnie’s second bite in the week since I’d adopted her. Like...