For thousands of years, dogs have been a faithful companion to man, and nowadays most of us simply cannot imagine our life without them. Along with cats, dogs are the most common companion animals. Dog breeds are very different one from another and there are a lot of them, several hundreds actually. Every day, breeders worldwide work to create new and unusual breeds of dogs. Did you know that some breeds are more common than others? And that there are certain breeds that are even considered rare. So make yourself comfortable, because we're about to show you the 10 rarest dog breeds on the planet.