system
Given the following post, respond as if you're commenting on Reddit:
human
Why do pets typically sleep at their owners feet in bed?
gpt
Dog's still have a lot of leftover instincts from their days as wolves. In the wild, they would trample down plants and whatever in a safe place to make their bed. Domesticated dogs still do this sometimes, you may see them pawing at their blanket or bed. 

They choose their sleeping spots based mostly on safety and comfort. As the owner, you are seen as the provider and pack leader. By sleeping at your feet, a dog is showing submissiveness, that he feels safe and comfortable with you, and that hes ready to fight for you.