What she has learned about arriving
From her side, the sequence is electric: the car slows, turns into the familiar car park, and the place where the best part of her day happens appears through the glass. Jumping, spinning and scrabbling at the windows is what she has always done in that moment, and it has always been followed, within seconds, by the door opening and the walk beginning. The behaviour is therefore not really about the windows; it is anticipation with nowhere to go, strengthened by a perfect record of paying off. Dogs who travel in a crate or behind a guard may bark and bounce instead, but the lesson is identical. To change it, the door must stop being the automatic next step after frantic behaviour, and start being the reward for a moment of calm.
Rebuild arrivals in small, boring stages
Start somewhere mildly interesting rather than her favourite walk, so arousal is low enough for her to think. When you park, do nothing: engine off, no door opening, no talking her up. The instant she offers anything calmer, four paws on the seat or floor, a sit, a look at you, mark it and reward it, then clip the lead on while she is still in the car. Only then open the door, and if she erupts as it opens, close it gently and wait again. This feels slow the first few times and dramatically faster within a couple of weeks, because the rule is crystal clear to her: calm behaviour makes the car open, frantic behaviour makes nothing happen. Practise the same pause at home after dull journeys so parking itself stops predicting excitement.
Add journeys that do not end in a walk
If every car trip ends at a beloved walk, anticipation will always run at maximum. Mix in trips that end at a quiet street for a short lead walk, a drive where you park, let her watch the world calmly, reward settling and drive home, and arrivals where she waits while you load shopping or talk to someone. Visiting the favourite place sometimes and simply sitting in the car park practising calm before leaving teaches her that even the best view through the window does not guarantee release, which lowers the desperation behind the jumping. Keep her physically secure during all of this with a harness and travel restraint or a crate, both so she cannot launch at the windows unrestrained and so a door opened in a lapse does not put a loose, overexcited dog into a car park.
Safety and comfort checks behind the frenzy
Some window-jumping is worsened by discomfort rather than joy: a dog who travels nauseous, overheats in a sunny car or finds the motion stressful may panic as the car slows because the journey's end cannot come fast enough. Compare her behaviour on arrival home, where there is no favourite walk, and during the journey itself; drooling, lip-licking, panting or restlessness throughout suggests travel sickness or anxiety worth discussing with your veterinarian rather than pure excitement. Never leave her in a warm parked car while you wait out her frenzy from outside, and crack the training problem with you seated inside instead. Also check windows, locks and door handles for damage, since an excited dog can open a window or damage seals in ways that become a safety issue on the next journey.
Make every driver run the same pause
The rule collapses if one driver waits for calm and another flings the door open because the car park is busy or raining. Agree the household standard: park, pause, reward calm, lead on inside the car, then door, whoever is driving and however keen everyone is to start the walk. Passengers need the same briefing, especially children who may open a door early in their own excitement. In KinsLe, Care Teams lets you write that arrival pause into her travel and walking duties and mark practice arrivals complete, so the calm moment she offers a family member in the driver's seat earns the open door exactly as it does with you.