Hi I have a litter of 5 [breed removed] 9 days old I've noticed one has a really flat chest is ther anything can do to fix this and is there a cause for this I'm questiong evething if anybody could help it would be much appreciated

http://leemakennels.com/blog/dog-breeding/how-to-save-a-swimmer-puppy/

Unless I'm barking up the wrong tree, this does sound like a swimmer.   Perhaps this link might help.   There is other info. if you check online.  And you might have your vet involved?

Every time you see it on it's chest roll it on it's side.

Google 'swimmer puppies'...