Read the text and choose the best heading for it.
The word “dog” refers to a species of animals within the canine family. Dogs typically live within households and are owned by people as pets or as working dogs, which makes them domestic for the most part. There are some very friendly dogs that are great for families with children of all ages. Since dogs can pick up scents that humans cannot detect, they are also valuable additions to law enforcements teams, where they perform activities like smelling for drugs and weapons.

• Helpful indeed
• Most loving ones
• Outdoing the humans
• Little but not the least
• Testing IQ
• A true friend
• Distant relatives
• Becoming dangerous