The three year old Border Collie suddenly bite 1, the dog perceived danger, want to protect their master. It may be that some strangers make the dog feel threatened, so the stranger launched an attack. 2, dogs by nature like to chase, if people and dogs chase and fight too hot, the dog play up to collect may accidentally bite people. 3, dogs because of illness and more irritable, dogs do not feel well have a lot of performance, the owner should pay attention to observe. 4, the survival environment of animals is more competitive, so animals With a very strong vigilance, the dog is the same, if the dog has also been in such an environment, then its vigilance will be very strong.
