Most cats link carriers to vet visits and hide on sight; the fix is stationing the carrier in the living area, door open with soft bedding as a regular nap spot.
Progress by feeding treats and meals inside, moving them deeper, then closing the door for seconds and reopening, gradually extending to lifting and short walks.
Choose top-opening or dual-door models so the vet can lift the cat out from above rather than upending the box.
Line it with a home-scented towel before travel and consider pheromone spray per vet advice; training takes weeks, so last-minute cramming barely works.
