@Nan-s-Place0Now that I'm several months into hosting, I charge a $25 fee per dog. As a dog owner myself who likes to travel with two dogs, I think that's more than reasonable.
I'd say about 75% of my guests bring dogs. And believe it or not, most have not required that much extra cleaning. A couple guests had dogs that shedded quite a bit and that took some extra time. But for the most part all the dogs have been clean and tidy.
Show dogs are generally kept very clean, but 6 dogs is A LOT to have in the house. I didn't check your listing...is it a shared home or entire place? If it's a shared home I'd have to decline. If it's the entire place I think $100 or even $150 is more than reasonable. She couldn't take 6 dogs into a hotel!