why do everytime we stare a dog---

Because in dog language- Eye contact is a sign of aggression.
You should not make eye contact with a dog you are just meeting.

They get agitated because eye contact is like a challenge or provocation to them. The barking usually is a warning sign or distress when they're around strangers.

i thinck that dogs are more inteligent that cat's ... i don't say that cat's are full but they do the most time what they licke they are somehow muck rebbels. And for dog's i thinck that the eyes are the key to our soul... and when we loock at them in a bad way they understand and if they are scarry they run away, and when we loock at them with pleasure or to regard them then they barck of happiness or they are freindly with us.

u can NOT have very much time with aniamls. When u stare at an animal that is a challenge to them. When u stare at a dog, most dogs will do more than bark, HAHA. My dogs will growl to tell u to back down, then the next move will be not yours, it will b my dogs and most other dogs bitting u...That won't be a HAHA for u, maybe for the animal....

REMEMBER ALWAYS LUV/ CARE FOR YOUR DOG/ PET, THEY WILL ALWAYS LUV U..