I think this has been posted before, but I bought a custom dog cover for the cargo area for my Model S made by a woman named Roseanne Chamberlain. You can get a lower cost option on Amazon, but I just wanted to say how happy I am with this product. It is custom cut, and the material is really durable, but with some padding. Took our English Retriever out for the first ride today and it went really well. I found Roseanne on an older post from somebody else who was happy with her work. If you are in the market for a cover to transport your dog, I’d recommend taking a look at this.