Classic short: character.

Once upon a time, there was a hunter who lived in the mountains of the mountains, hunting for a living.
Raise a wife to raise children, it is happy to melt.
One day, at the end of the day, without hitting a prey, he was dragging his tired body to return when he suddenly found a Wolf howling.
As he looked, he saw a wounded Wolf crawling into the blood of tears.
The hunters were overjoyed.
As he approached, the Wolf cried and cried for help.
With a sense of compassion, the hunter carefully carried the Wolf to his home, carefully feeding and healing.
The daughter-in-law is good advice, let him kill the Wolf, with the end of the disease, he berated his wife.
The hound sometimes demonstrated in front of the Wolf, and he beat his dog.
At last one day the Wolf was healthy and took French leave.
One time, the daughter-in-law went back to her mother's house, and the mountain was far away, leaving the child at home.
When he went hunting in the mountain, he left the hound home to take care of the children.
When he came home at night, he was completely stunned by the sight.
The son was lying on the ground, dead.
Blood was everywhere, and the hounds were covered with blood, and they crawled near their son.
The hunter could not say, chasing the hounds.
When he reached the house, he found that the Wolf he had fed was wounded and died there.
At that moment, the hunter realized what was in front of him, consoling the misunderstood dog, crying and regretting that his heart had killed his beloved son!
The story leaves us with infinite thinking...

There must be three types of people in your friend's circle:
Human friends.
The most basic human nature is to have the same kindred spirit, to be intimate, to be human, to be human, to be human.
Dog friends.
Loyal and trustworthy, the most is sometimes difficult to control, turn the face heartless, scream a few sounds;
Wolf friend.
With the name of the master, not to be a father, can share the benefits, have a difficult to run things, even a bite.
You can do anything for your own little benefit.
Make friends with friends, and tolerate dog friends, but never make friends with wolves.
After all, the tolerance of the beast is a crime against oneself and the family.