There is a reason why a dog is perceived as man's best friend. Sometimes they're fun, goofy, and mischievous while at other times, they can be serious, intelligent, and understanding. They're the best boys (and girls!) and many would argue that they are the best pets out there.

No matter the number of positive aspects canines as a species possess, there is one unfortunate downside. Dogs, just like most of the other animals, don't live forever. They age and get sick and slow down. The upside? Pups don't really care about it! Even if they're getting old and their fur is turning grey, they play and love and enjoy life just as much as they did when they were puppies. And even if most people say that lil' baby dogs are when they're the most adorable, we'd like to argue that senior dogs are just as cute. You think you'd disagree? Take a look at these precious dogs who have lived their lives to the fullest and are now enjoying a well-deserved 'retirement'. Oh, and don't forget to comment and vote for your favorites!