When we talk about loyalty, love and all these things, I personally do think they exist. I’ve seen vast differences in how my dog treats one person versus another person in the family. I can’t say exactly how we measure [a dog’s] love, but I can say one of the ways we can look at the relationship between a dog and a human is the reinforcement history. That could be through traditional training, it could be rewarding the dog with a cookie for sitting. But it could also be the fact that we like to cuddle at night—that’s reinforcing for both of us.