Whining in the car at the end of a journey

[EOpenshaw]

My German Shepard has got into the habit of whining at the end of a car journey before we get him out of the car. And then he is desperate to get out of the car. I’m thinking this is more anxiety than excitement but I’m not sure what has caused it. Any ideas on how to solve? Most trips are for walks, he loves the vets and we never leave him in the car on his own. On the journey he is normally settled it’s just at the end of a journey.