When a Seattle couple’s dog developed reactivity to other canines, they solved the problem by developing a yard-sharing app written by Rachel Gallaher Nearly six years ago, two Seattle tech workers, Ana Malhotra and Sahil Naikwadi, brought home a small, white husky puppy and named him Rome. The dog joined the couple, who first met in college, in their high-rise apartment on First Hill. Everything was going great—the trio took walks around the neighborhood and spent time at a nearby dog park—but then, Rome started getting sick. “He kept getting giardia,” Malhotra said, “and as first-time dog parents, we didn’t…