All dogs do this, it's a defense mechanism
All dogs will do this, it's a survival trait as when something threatens the dog they bark and bush out the hair to make themselves look bigger then they are
Some hairs do stand up from fear. An example is the 'hackles' that stand the hair erect on the back of dogs and other animals when they are ready to fight. When the skin tightens during an adrenalin rush, the hair appears to stand up at the roots, but this is hardly noticeable with the soft hair of most humans.
it means he is kind of nervous just like the hair on our arms stand up when we are freaking out!! my dogs do the same thing when they growl at someone or some dog thats new to them!
They get their hair to stand up by the cunning application of hair gel.
The friction between your hair and the balloon cause static electricity causing your hair to stand up.
You cover your hair in hair gel then you comb it up
shadow --------- Your hair --------- Your feet
If your cats hair stands up it means the cat is angry
The hairs on the neck and back that stand up when a dog is showing aggression are called "hackles."
Your hair has picked up extra electrons. This causes your hair to repel against each other(Like charges repel remember!). Because you hair is so tightly packed, the furthest any hair can get from another hair is to stand straight up.
If you have goosebumps
static electricity
Humidity and Static Electricity