re: Elderly dog barking at night, pacing, and seeming restless - any pet owners with advice?

Based on our experience with elderly dogs, dogs get more needy, and anxious, as they get older. They want someone near them all the time for comfort. They sleep more often, and their schedule gets disrupted. They want to eat or drink at all hours. We're working with our vet to manage things with our current old girl (18 yrs old) as best we can, so long as she isn't suffering, and still enjoys life. Antibiotics, Pepcid, and anti-inflammatories are keeping her comfortable for now. Your vet might need to check for anything that might be amiss, besides just the age, and what might help. Good luck.