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

Sounds like some sundowning happening, with old age dementia. I’m so sorry. 13 is a good run for a shepherd. I had to help mine cross the bridge a week after turning 13 2 years ago, I’d give anything to have her back, and still miss her so much. I’d gladly give up sleep for her. But she couldn’t walk anymore and after months of having to help her up with a sling she began to tell me she was too tired and “no more.” Just love on your dog, time may be short. Please don’t get annoyed. She gave you her devotion all these years. You are her world. Now, she becomes your world until it’s time. CBD might help some of the symptoms of old age. But you will know when it is time.