Trina first of all, so sorry to hear about your Lab passing away. It must be already traumatic.
As for the GSD, I that they need some extra care and attention, dogs are pretty perceptive about things. I would say it's important to get Bruno back into a routine, even if it's just for shorter walks, to get him back into some rhythm. The AKC has a good read on the topic, and even book recommendation https://www.akc.org/expert-advice/health/do-dogs-grieve-other-dogs/
Hopefully time will help to heal both you and Bruno.