First, don’t worry! I had to drive my 4 buns almost 3 hours each way to the vet for their vaccines and they all did great.
I line the carriers with a pee pad or a towel and a layer of nice fluffy hay on top. I also brought a baggie of some favorite fresh greens. When we got to the vet the vaccine itself was very fast, so I actually waited with them in the waiting room for about 30 min just to give them a break from the driving. I also offered them some greens during that period. Some of them ate some, some didn’t, but I wasn’t too worried about it. In your case I wouldn’t worry if she won’t eat at the vet’s, especially since your total trip time will be under 6 hours (probably closer to 2 or 3).
When you get home, just let her chill in the carrier for a few minutes, and then put her back in her home turf and let her rest. You can offer some freshly rinsed salad then too. If she doesn’t want to eat by dinner time, you should syringe feed her. Sometimes with a stressful event buns just need a syringe feeding to help them get rehydrated and perk them back up.
Most buns do fine with car rides, especially free-way driving. They don’t love it, but after a bit they settle and rest in the car.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.