Yes dogs grieve. We had two Sheltie males from the same litter. Brothers that never were separated their entire life. When one died the remaining grieved visibly for 6 weeks. It was heartbreaking. Bad enough to lose a pet but to see the profound effect it had on our remaining dog was just terrible. He eventually became his old self.
I think I'd wait until your lab seems back to normal. Then consider a new dog.
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