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.