I applaud all you pet owners that actually let Disney know you have a pet with you. Based on my 1 month stay in August, it appears there are a large number of people that do not. We were in a non pet loop (1100) and there were pets in our loop the whole time... even when there were only 4 sites occupied. Our friends had their dog with them and asked about staying in the 1300 loop but were told it was a non pet loop, yet every time we "looped" through on the golf cart, we saw many dogs.
I'm guessing people don't say they have pets so they can avoid the extra charge, but it's frustrating when your friends are told they can't stay in a loop, close to you, because its pet-free, yet you see 1/4 of the sites occupied by pets