Meaning The idiom “man’s best friend” refers to a dog or a group of dogs. It can also describe the lifelong relationship between humans and their dogs. People use the saying “man’s best friend” to show that dogs are more than just pets.

man’s best friend Meaning It refers to animals that are of use to human beings, mostly used to address dogs. Loyalty and valuable services that dogs provide to human beings make them worthy of being called man’s best friend.