I just read a book by the wonderful author, Alice Hoffman. It's her newest book called "The Museum of Extraordinary Things." I thought the following excerpt was a concise and beautiful way to express the amazing creatures that dogs are as well as a life lesson for us all:
Now Mitts (the dog) trotted briskly beside him on their journey downtown, clearly happy to be alive, with no thought of the future or the past. For this Eddie envied Mitts as well, how light his burden was, how clear his purpose. He was to be his master's companion and in doing so he became himself, the essence of a dog.