These cat window shelves are Ikea hacks, just regular shelves with a nice soft bed on top. Would be a good idea to put Velcro between the bed and the shelf to help keep it in place. And never mind the link, it doesn't lead anywhere of relevance.
DIY car seat cover for dogs, hammock style keeps them from jumping into the front and keeps them from hurting themselves if there is a sudden stop. and keeps the hair out of the car! Keeping the hair off the car seats is the aim of the game.