Poor dog- so many animals (yes, I know, children too) get caught in bad divorces and split up, it is so sad. Problem is, those dogs, especially if young and not getting the necessary training, can be damaged for life.
Another sad fact if that many SPAs in France, do not spey/sterilise dogs and bitches before re-homing, especially in the SW. Fortunately our local one does systematically.
Sadly, SPAs in FRance are full to the brim with animals- so often left after UK families leave to go back and leave the animals behind (donkeys, horses, etc, etc). Tragic.
So yes, let's hope for a solution for that poor pup.