Read the text and choose the best heading for it.
The strongest sense for dogs is smell. In comparison to humans, dogs have almost 25% more scent receptors. As a result, dogs have an excellent sense of smell. Just as many as humans rely on their sense of sight to navigate, dogs rely on their sense of smell to understand and explore their surroundings. Dogs can smell scent about 100,000 times more acutely than humans. Because of their acute and accurate sense of smell, some breeds of dog are unique indeed.

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