No, you aren't the only audi ownder with a dog
I use the canvas on one side and thin rubber on the other to protect my back seats. There are 2 straps that the head rest fit over to keep it in place as well as slits for belt buckles like some of the ones
here. I used it in my volvo s80 and now in my avant. the cover fits a bit better in the audi because the volvo's back seat was a bit bigger. The hammock ones look 'safer' so your dog wont hit the floor if you hit the brakes but if you use a dog seatbelt-harness you dont have to worry about that at all.
Then there are
these; which are more like car seats or booster seats instead of covers... I have one of these as well (yes, i am an one of those INSANE dog people
) but don't really use it. I do think the drawer under the seat is a great idea, use of space and place to stash some of the immediate dog trip essentials.
Many choices of fabrics and materials but most of all keep your buddy safe then keep the 6 clean. We just went to Palm Springs in the avant this weekend and instead of putting the crate in the back like a lot of folks do we had the cover then a bed pillow thingy and a belt harness for lord helmet's spoiled travel and kept the crate collapsed in the cargo area with the bags and other luggage.
I just bought my avant a couple days ago so it was a great trial run out to the desert and back. The car, the pup, my lady, and i did just great.
good luck,
pandas
Pet Seat Cover
. 
