A crate in the car beats a trailer at this size
A Nigerian Dwarf travels to the vet in a large dog crate inside the vehicle, because a goat this small rattles around in a livestock trailer built for cattle. The crate should be tall enough for her to stand at full height with her head up, long enough to lie down in, and solid enough that she cannot chew or push through it. Set it on the flattest part of the car floor or cargo area and wedge or strap it so it cannot slide or tip, since a Nigerian Dwarf shifts her weight suddenly and often, usually toward whatever she wants to look at.
Latches and lids: planning for an escape artist
A Nigerian Dwarf treats every closure as a puzzle set for her amusement. Goats of this breed work crate latches with lips and tongues, climb anything climbable and squeeze through gaps that look impossibly small. Use a crate with a metal door and a latch she cannot mouth open, and add a clip through the latch for the journey if she has form. Never carry a Nigerian Dwarf loose in a car; a goat on the seats will be on the dashboard, in the footwell and under the brake pedal in spirit if not in fact, and a goat loose in an open truck bed can leap out at a stop.
Footing, bedding and something to chew
A Nigerian Dwarf rides calmly when her feet feel secure and her mouth is busy. Cover the crate floor with a rubber mat or a folded blanket, then add straw she can nibble and rearrange; bare plastic makes a goat scrabble, and scrabbling goats arrive wound up. A small hay net or a handful of her usual hay gives her the steady chewing that settles ruminants, and hearing her cud quietly in the back is a fair sign the trip is going well. Skip grain treats on the road, which excite rather than settle and can leave a rich stomach to deal with at the clinic.
Company, air and the trip itself
A Nigerian Dwarf is a herd animal travelling away from her herd, and that is the stressful part of any vet trip. If a bonded companion can ride along in a second crate, most does settle far faster, and the companion's presence at the clinic keeps calling to a minimum. Keep the car ventilated and comfortably cool; a small goat in a sun-warmed car overheats quickly, and a crate in direct sun through a window is a trap even on a mild day. Talk to her occasionally on the drive if she calls, but skip stopping to open the crate for reassurance, because a Nigerian Dwarf halfway out of a door in a strange car park is a chase waiting to happen.
At the clinic and back to the herd
A Nigerian Dwarf should stay crated until the vet is ready, since a busy waiting room is full of dogs and a loose goat will climb the furniture. Lift her out holding her securely against your body, one arm under the chest and one behind, and expect the spring-loaded jump the breed is famous for. Back home, put the crate inside the pen before opening it so she steps straight back to her herd mates, and watch the first few minutes of herd politics if she smells of the clinic. A doe in milk travels with her recent yields and any udder notes in KinsLe's Pet Passport, so the vet can compare today's goat with her own normal.