There is a blind dog that has its own seeing-eye dog.
Baboons will sometimes ‘kidnap’ feral dog pups to raise as pets and keep for protection, eventually forming a symbiotic relationship.
There was a dog who obtained over one million delta airline miles in his life and had his own frequent flier card.
Using a basic food-reward system, normal household dogs were trained to detect both lung and breast cancer with 90-100% success rate when checked by biopsy-confirmation, only by smelling patients breath. This also after only a few weeks of training.
A dog can instinctively solve calculus problems when playing fetch.
In 1991 a girl was found in Ukraine who had lived with and been raised by dogs for most of her life.
Nazi scientists claimed to have trained a dog to call “Adolf Hitler” as “Mein Führer”.
There are more dogs in Paris than people.
Male French bulldogs are unable to mount females due to defects caused by inbreeding. In order to breed, female French bulldogs must be artificially inseminated.