I use a vet blanket with a fine layer of greased shredded paper which is changed several times a day,along with vet blanket if needed.
Swimmer pups will try to stand up but will look as though they are swimming when moving. Watch the back legs especially. Very similar to new borns moving around. I believe an overheated whelping box to be a main threat. If you use a lamp then
raise it until you get that correct temperature.
Bed sheets/linen will cause problems if consumed
by any dog. It should never be used as bedding.
I don't know about the shavings but paper will
eventually produce dust if left long enough. I don't
believe a dam would eat too much paper by
cleaning up. Long as you clean that paper up
regulary then i don't see a problem.