http://www.ksrpetcare.com/

KSR PetCare in Arlington/McLean/Falls Church. Great walkers/sitters. Not sure if they serve your area of Arlington, but they do serve part of Arlington, so it's worth a shot.

OP here, I am in Arlington.

Where are you located? If in Fairfax area I would try Agape Pet Care. http://www.agapepetcare.com/

Any recommendations? We need someone who will come to our home overnight. One dog is older and needs assistance/uses a wheelchair so we need a reputable, compassionate dog person. We do not have family in the area or friends we trust with the dog.