Adopting Max, the least wanted dog at the shelter, was a decision I made with my heart. My family thought I was crazy—especially my husband—when we brought the wild and jumpy German shepherd home. But my son adored him instantly, giggling as Max's floppy ears bounced around. The house was full of life again. A few weeks passed, though, and Max started behaving strangely every evening, staring intently at the empty backyard and growling low. My scream echoed through the night when I realized what Max had been sensing all this time.