Hi there.
I have a dog crate especially made for my Rover 75 Tourer by Hamster Baskets. You can see photos and dimensions in the photos here
https://photos.app.goo.gl/1VspQnsooedhKt3FA
It is made of plastic coated steel so it is sturdy and doesn't rattle. The top panel can be removed for taller dogs. It can be folded up for storage. You can get a new one from Hamster Baskets for over £400 or buy mine for £60! Collection from Falkirk or I could organise postage as well I'm sure. It was big enough for my sadly departed two labs.
BTW - it also fitted my 2016 (2007-2017) Volvo V70 beautifully as well.