What do you use to protect car upholstery? [closed]

I've had a Kurgo seat protector and it was better than nothing, but the dogs kept pushing it to the side to lay down on the seat itself, and they'd especially push it to the side if they were going to throw up, so I didn't find it totally useful. Honestly I didn't notice it keeping the bulk of dirt or hair off the car seats and I wasn't a fan of the look.

My current solution is a wool army blanket from a surplus store which covers the entire back area of my car (a Fiat with the back seat permanently folded down). It's tucked in tightly on all sides, and after months of use and dozens of dogs back there, some of them insistent diggers, it has remained solidly in place. I could not be happier with its performance. It's durable and nice looking, and of course would be very useful if I found myself lost in the wilderness or something.