Dogs can sense illness, storms and disasters
It is reported in many polls that many pet owners see their dogs acting weird before an earthquake or storm. They become aggressive, start crying or hide in a safe spot. This is also referred to as the dog's sixth sense.
Tail wagging is a sign of love, fear, aggression, and insecurity
Let's break out the false notion that dogs wag their tails when they are happy. According to Discovery's website, dogs wag their tails to the left when they are scared, and to the right when they are happy. Also, they wag their tail low when insecure. A dog can also wag his or her tail constantly when they're aggressive.