Semi-related: "Why old dogs are the best dogs"
https://theweek.com/articles/511596/why-old-dogs-are-best-do...> Puppies are incomparably cute and incomparably entertaining, and, best of all, they smell exactly like puppies. At middle age, a dog has settled into the knuckleheaded matrix of behavior we find so appealing — his unquestioning loyalty, his irrepressible willingness to please, his infectious happiness. But it is not until a dog gets old that his most important virtues ripen and coalesce. Old dogs can be cloudy-eyed and grouchy, gray of muzzle, graceless of gait, odd of habit, hard of hearing, pimply, wheezy, lazy, and lumpy. But to anyone who has ever known an old dog, these flaws are of little consequence. Old dogs are vulnerable. They show exorbitant gratitude and limitless trust. They are without artifice. They are funny in new and unexpected ways. But, above all, they seem at peace.