Browse our Pet Friendly rentals in Loudoun County. Several of our properties rentals allow pets, because we know how important it can be to travel with the family dog. As long as your dog is on leash when out and about, Loudoun County is a pretty pet-friendly area. Take your dog on one of the many area hikes, stroll the downtown area, or dine at an outdoor patio. Our dog friendly properties allow dogs up to 50lbs, and the charge is $99 per dog.