Well, you're absolutely right. Man's best friend, who expects nothing in return but does everything for his owner's safety, is a dog. They do everything in their power. 

Look at Brownie, who keeps an eye on people passing by, even though she's ill. https://image.nostr.build/d038a21a7612929ba5e1e6346811b739cc652dd0b11e3aba072d5e32f48a514a.jpg