I know you won't be able to replace the dog.
Our older dog died. We now have a new dog. I think this is sweet - the other day our DC said she thinks they would have been friends
I often wonder if the new dog knows another dog use to live here (probably can smell it -though we do clean

No idea why that plays on my mind. I will say sad memories of the old dog are tempered - I would say overwhelmed - by the presence of the new dog.