Motion sickness, or the car only ever drives to the vet. Both create bad math about cars.
Very common, very fixable. Many former car-haters end up sleeping through highway trips within a couple of months.
All of these are in the Pawty Marketplace, filtered to retailers that deliver to your country.
Pawty is educational content, not veterinary or behavioural advice. See a veterinarian for any sudden behaviour change or sign of pain, and a qualified behaviourist in person if your dog has bitten, guards with snapping, or panics when left alone. Read our approach.
Pawty also has 99 training skills in 3-minute sessions you rate 1 to 5 paws, streaks that freeze instead of reset, and a care calendar. Free. No subscription, no paywall.