The agency is holding the TSA Cutest K9 contest in honor of National Dog Day on Aug. 26.
Voting is now open on the TSA's Instagram account, and voting closes at midnight Saturday.
The finalists are; Muk, from Austin–Bergstrom International Airport; Figor, from Chicago Midway International Airport; Alfie, from Phoenix Sky Harbor International Airport; and Donna, from St. Louis Lambert International Airport.
The TSA has more than 1,000 explosive detection K-9 teams nationwide that help with screening passengers and cargo and other security missions.
The K-9s were nominated by TSA handlers from airports around the country.
The winner will be announced Aug. 26.
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