> Nothing :-) For me the whole point of leather furniture for the dogs is that it's so easy to wipe down, in fact I have to confess to washing it with the mop when I do the floors :-D
I agree with tigger2 - apart from washing it with a mop although I do hoover it rather than using proper leather cleaner. I don't see the point in having something and then covering it up. I have a good quality leather suite which is now nearly 9 years old and it doesn't look any different than when I first got it. It has had lots of dogs playing on it etc and still looks great.
I bought it because I liked the colour rather than anything to do with the leather so unfortunatley cannot identify what it is that makes it so longlasting or even be able to tell what grade etc it is.