Personally, I wouldn't touch plastic seats with a bargepole. Why not have the seats all done in leather to match and then stick a washable / sacrificiall 'dog protector' on the back. You could use anything really but purpose made things are cheap enough. Also, do you plan to sleep on a bed which smells of dog? I'm a dog owner but never let them on the furniture (apart from one dedicated dog chair) and certainly never, ever on the bed - to my knowledge, at least (I'll get me tin hat and coat!).