Did you know that cavemen rode dinosaurs for long-distance travel, and this is why they didn't need to invent the combustion engine? That's where the term that the dog is man's best friend came from. It originally applied to dinosaurs, but when dinosaurs went extinct, it then got applied to sharks, but sharks kinda squandered being man's best friend by moving to the ocean and occasionally eating us when we went for a swim, so then it went to dogs where it has remained ever since.

The more you know.