When we adopt a dog or any pet, we know it is going to end with us having to say goodbye, but we still do it. And we do it for a very good reason: They bring so much joy and optimism and happiness. They attack every moment of every day with that attitude.
Because of the dog's joyfulness, our own is increased. It is no small gift. It is not the least reason why we should honor as love the dog of our own life, and the dog down the street, and all the dogs not yet born.