The main purpose of this legislation, known as the "Honoring our K9 Heroes Act," is to create a grant program that helps cover medical care costs for retired Federal working dogs. These dogs often served in law enforcement or military roles and may require medical attention after their service. Key provisions of the act include the establishment of a grant program managed by the Secretary of Homeland Security. This program allows eligible organizations to apply for funding to assist with the medical expenses of retired Federal working dogs.