Yes, unfortunately we experienced that with our 14 year old Lab who passed in early April. She started this, then not sleeping at night, which was rough on us. After a couple of weeks of this, we got meds from our vet, which helped, but she was back to this night time behavior in a few days. Switched meds, helped, then back to the same. After an increase in this behavior and increased difficulty in walking we made that tough decision. In spite of it, she was ready. I don't know how to explain how we knew, but she was. It was peaceful for her. Oh how we miss her.