
I don't know either..... but knowing that canines are able to reabsorb the whole litter early on if something "isn't quite right"...and knowing that a canine is able to delay labour if something "isn't quite right".....then I often wonder if it has to do with the girl delaying labour herself because she's not feeling quite secure enough...??
I bitterly regretted all the decisions I made on behalf of my girl with one litter...I had her scanned so all the soft belly fur was gone...I was backwards and forwards to the vet with her...I had moved her Den at the last minute...I fretted about weighing puppies...whisked her and the pups off to the vet for a checkup. My stress levels were so high that even that would have been enough to make her feel insecure. Poor girl :(
Now I don't scan...don't interfere with her Den...keep everything as calm and peaceful as possible. When she starts I give her solitude and just observe the miracle quietly from a distance..I don't speak...have as lower light as possible....and don't handle the little ones for at least several days to allow her to bond with them. I trust her instincts...and am better able to trust my own judgement that both she and I will know if something is wrong....
I dunno...I sometimes think that everything can get a bit too "high tech"...and I'm not always sure its the right thing to do given that Mother Nature has been overseeing the miracle of birth for eons