"Keen sense" refers to having a strong ability to perceive or understand things very well. It means being highly observant, intuitive, or knowledgeable about a particular subject. Full definition
Cats are equipped with keen senses of smell and hearing. (wideopenpets.com)
I'm usually outgoing, intelligent, with keen sense of humor, interested in the arts, sports (mostly watching), travel, dining. (widowersdatingsite.com)
The dogs of this breed have keen sense for smells and exhibits dominant personality. (puptopia.in)