I have a 70 lb. German Shepherd and recently sold my SUV to get an electric car (Chevy Bolt). There is a bit less room in the back, so she was uncomfortable at first.
After I put in this hammock, she warmed up to the space and now leans on the front side, I think she feels safe against it. Not to mention, I don't have to worry about her getting the new leather seats all dirty.
I love the option of being able to fold down either side easily with the zipper as well. I have spilled a little of her water in the back and haven't checked the water resistance, but it was only a little bit, so for now I'm assuming it is as the product says - waterproof.