Make the carrier part of the furniture first
A Domestic Shorthair struggles at the carrier because in her experience it appears only on vet days, smelling of disinfectant and predicting a car ride and a strange room. The fix starts weeks before any trip: put the carrier in a room she uses, door fixed open or removed if it swings, lined with a blanket that smells of her usual sleeping place. Let her investigate it entirely uninvited.
Hard-sided carriers that open from the top as well as the front are easier for training and for vets, and if hers only appears from a cupboard smelling of storage, wash it and let it air in the room.
Feed her way in, one threshold at a time
A Domestic Shorthair's trust in the carrier is built with her stomach, in stages she chooses. Start by placing a high-value treat or a little of her favourite food just inside the open door while she watches, then retreat and let her take it alone if she prefers. Over days, move the food gradually to the back of the carrier, then begin feeding occasional full meals in there with the door still open. She should be walking in, turning around and eating relaxedly, tail up, before anything about the setup changes.
If she will take treats at the door but not step fully in, the step you are asking is too large; feed at the threshold for more days rather than placing her inside, which would spend in one moment the trust you have been saving for a fortnight.
Close the door, lift, then drive — in that order, slowly
A Domestic Shorthair who eats happily in the carrier is ready for the door to exist again. Close it while she eats, open it before she finishes, and build the closed time by seconds and then minutes across sessions, with you sitting beside her talking normally. Next, lift the carrier a few centimetres and set it down; then carry it to another room and back; then out to the car and back inside without starting the engine. Each stage repeats until it bores her, and every practice run ends with release and a meal or play, so journeys that go nowhere good vastly outnumber real appointments.
The first practice drive should be minutes long and end at home, not at an errand. A cat whose only car experience is a long, urgent trip has learned the worst version; several dull short ones rewrite the lesson.
Protect the training on the days it counts
A Domestic Shorthair's carrier habit survives real trips if you keep the ratio right. After every genuine appointment, give the carrier a rest day or two, then resume meals and treats in it so the last experience does not stand as the final word. If an emergency ever forces you to put her in before she is ready, use the top opening if there is one, lower her in hindquarters first with support, and return to the feeding stages afterwards rather than assuming the training is ruined; one bad day undoes less than owners fear when the good days resume.
Tell anyone who handles her — family, sitters, the vet practice — that she is carrier-trained and walks in herself, so nobody grabs her by habit and breaks the pattern. If she suddenly refuses a carrier she previously used, or shows pain signs when lifted, a veterinarian should check her, because reluctance that appears from nowhere is sometimes a body problem, not a behaviour one. Sharing the daily stages is what gets a cat here, and KinsLe Care Teams lets your household split the Domestic Shorthair's carrier meals, door practice and lift practice into named micro-duties, each one marked done with its timestamp.