Research has shown that dogs are able to smell density changes in the air and while not having the same concept of time as we do, they notice passing time.
That’s not because they don’t want to get wet but because the sound of the raindrops hitting the ground actually hurts their ears. That’s why an umbrella will make it even worse because the amplified sound is so much louder to them.
A dog’s intelligence can be compared to the brainpower of a 2 year-oldtoddler. They both can learn roughly 250 words and gestures. That’s why they usually get along so well.
They can categorize positive and negative emotions, an ability that is normally only observed in primates which makes dogs a highly social species.
A mirror-like structure in front of the retina enables dogs to see better in darkness than humans.