Dogs cannot see so-called "unclean" things. Dogs' vision far exceeds that of humans, so dogs sometimes behave abnormally, such as howling, running around, etc. This is because dogs see strangers or The reactions of things are invisible to the human eye. Sometimes dogs will behave abnormally when they are sick. Owners should pay attention to the status of their dogs, spend more time with them, care about them, and play with them.