Unfortunately, the window treatment that's the most
dog proof is out of fashion right now: hard plastic vertical blinds (dogs shove them aside to look out, then they fall back into place when the dog is done looking, and you can wipe them down with any all-purpose cleaner to remove dog snot). It's a very 1980s look, unfortunately, but Home Depot still sells them.
We've shifted to top-down bottom-up cordless pleated shades
. You can leave the top open for light and close the bottom when you want privacy (which I love), and when the dog wants to look out, mine have learned to lift the bottom rail up with their noses (which is the way the cordless shades are designed to work--very small lifting pressure on the rail causes it to rise up). The dogs typically lift it just the right amount for themselves to look out. I often find the shades in my bedroom lifted to "dog height."
If you go this route (cordless pleated shades), the best pricing I've found is Select Blinds
(take the time to order a bunch of swatches before ordering your shades, as the actual fabric doesn't look like it does on the screen, and you may want to feel the texture of the material first). Some of their fabrics are heavy and some aren't. They have 30% off coupon codes routinely, and often run buy-2-get-1-free specials (and they pay a rebate through Ebates.com, if you are a member)--all that makes them a lot more economical than ordering custom shades anywhere else I checked (and I checked a lot
of places). Their shades have been holding up well for me, after about a year.