Hey,
I just picked up this cover from Amazon and it fits really well in the back of our X7. I don't have a big dog like the one pictured, but I did want something for trips to the hardware store or nursery....camping, etc.
It seems very durable and has multiple layers. Fits perfectly front to rear and comes up on the sides 6 inches or so...
Here is a link:
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1