A fat-tailed gerbil gets used to her carrier by treating it as part of her enclosure long before travel day. She bonds to places by scent, and she judges a new space by whether she can dig and hide in it. Carrier training for her is therefore mostly interior design: make the carrier smell right, dig right, and sit in her territory until it stops being new at all.
Let scent and substrate do the early work
Scent and substrate do the early work for a fat-tailed gerbil. Bury a few seeds and a small piece of her usual food through that substrate, and tuck in a cardboard tube from her enclosure. She will investigate on her own nocturnal schedule, dig, possibly move substrate in and out, and perhaps sleep there. Allow days of this before any next step. A duprasi who has scent-marked and rested in the carrier has accepted it in the way that matters to her species, even if you never saw the moment happen.
Close the door only after she chooses the carrier
The door closes only after a fat-tailed gerbil chooses the carrier herself. If she startles at the click, pair the next few closures with a favourite food placed inside at the same moment, so the sound predicts a reward. Build closed time slowly across evenings.
Add lifts and short carries around her territory
Lifts and short carries come next for a fat-tailed gerbil who rests calmly behind a closed door. Lift the carrier smoothly with both hands supporting its base, since a tilting floor alarms a burrowing animal far more than height does. Hold it level briefly, then set it back exactly where it was, so the first journeys start and end in home territory. Over sessions, carry her to a quiet spot nearby and back, speaking little and moving slowly. Keep the carrier covered with a light cloth if passing through bright rooms, because a nocturnal animal resting in darkness settles better than one blinking in full light. End every stage by opening the door back in her enclosure and letting her walk out under her own power.
Packing her carrier for the real trip
For the real trip, her carrier should be packed as a piece of her enclosure that happens to move. Keep a generous depth of her own substrate for digging and insulation, scatter her normal food through it, and include the cardboard tube she has been using during training. Fat-tailed gerbils drink modestly, and for a short journey a small piece of moisture-rich vegetable placed in the carrier at departure is a practical water source that cannot spill. The familiar smells around her will do more for her calm than any amount of talking through the door.
If she digs frantically or refuses the carrier
Frantic digging at the carrier walls means a fat-tailed gerbil has been pushed a stage too fast. Return the carrier to open-door duty in her enclosure for several days, refresh the familiar substrate, and let her rebuild the association at her own pace before trying closures again.
Sharing her travel routine with a helper
Her travel routine is specific enough that a helper should not have to improvise it for this fat-tailed gerbil. Note her active hours, the no-tail-handling rule, and the stage of training she has reached, where whoever assists will see it before the journey. Handing those details over in KinsLe through Care Pass gives a trusted sitter temporary clear access to her routine, so her carrier training holds together even if someone else makes the trip with her.