Dogs are more sensitive, very sensitive to the sound and smell, in the doorway easier to detect abnormal signals, and can react quickly according to the signal to protect the owner and themselves. The dog suddenly began to sleep at the door, this means that the dog has a sense of watching the door. The owner went out for a long time did not come home, the dog is more lonely at home, plus its sticky personality, always hope that the master can come back early, the dog will wait for the master at the door to meet the master. It is likely that the dog feels more comfortable at the door, because in summer the door will have the wind through the cracks, you can feel the cool. Plus lying on the floor to sleep is still uncomfortable, the door of every home will be placed a door mat, the dog lying on top and have a “bed”, more like lying on top to sleep.
