I have two dogs so I was wondering if the per night listed fees for every sitter are only for 1 dog or if multiple.
Every sitter here on Rover works for him/herself and may apply their rates differently. From your question, I assume that you would be hiring a house sitter to stay at your home and take care of your two dogs.
Rover's rate table works on the basis of "per dog." When you select a sitter(s), take a look at the rate table. Some sitters discount additional dogs and some might not charge anything at all.
On the profile sitter page, on the right hand side states Additional Services & Rates. For each profile make sure to click on that and read the drop down. It will give you the additional fee for 2nd, 3rd dog and all other services the rover host provides. Also make sure to page down past the reviews and read the complete profile. It will also show (Read More) to get the full profile.