I bought this for a 30kg Northern Inuit. Very furry, maults continuosly, and also loves any muddy puddles. I found the cover fitted well into the back of the car. I do not have a problem with the zip coming undone in the middle, but she tends to just sit and watch out of the window and does not move around. The cover is easy to use, and cleans down well. We have took her to the beach using this, and there was no sand in the car when I took it out. As she maults a lot, I did expect some dog fur to be left, but there wasn't much at all. I think it would be a bit unrealistic to expect the car to stay immaculate, but I was really impressed with this. Well worth the money. Would recommend.