But how does that growth happen? One study, “Post-Traumatic Growth Following the Loss of a Pet,” conducted by Wendy Packman and others, of the Pacific Graduate School of Psychology at Palo Alto University, found that after losing a beloved pet, many of the participants reported an improved ability to relate to others and feel empathy for their problems, an enhanced sense of personal strength, and a greater appreciation of life. Lynn Harrington, who lives in The Plains, Va., lost her 15-year-old Norwich terrier, Hap, about a year ago. “For many months, I couldn’t shake the sadness,” Ms. Harrington said. “And during these sad times, I finally remembered a lesson I learned many years ago with the loss of my first dog: Animals that come into our lives are gifts to us and can never be replaced. However, another animal can come to us and help us heal our hearts.” Shortly after that epiphany, a friend told her about a senior dog that needed a home, and a match was made. “There isn’t a day that I don’t think of Hap through a photo, a memory shared, or even some funny mannerism I see of him in my rescue dog,” Ms. Harrington said. “These moments remind me that I’m grateful for the animals in my life — they teach me about love and that I’m resilient even in times of great challenge or sadness.”