I think along similar lines for instant when we went to the bulldog breeder we nearly choose another puppy, I only changed my mind after seeing Leon's dad and asked if he had any pups sired by him, low and behold he had 2 left in a nest. And sometimes I sit there and think what a perfect dog and what would have happened if I choose that other pup then I get a sad feeling at that thought.
Dogs can feel energy and know from instinct if something is wrong. I hope and pray things improve for you.
Leon is echt en dikke boefje !!!