> take the vet bed out and replace it with newspaper for the time being
This is what I have had to do quite often.
I find shredding the newspaper works best and is useful activity while waiting for whelping or when supervising Mum and pups.
Take a newspaper and tear down the fold, then fold along the same way as the paper was folded and tear in half again, giving four lengths. Then turn 90' and tear into thin strips along the grain, and you will have paper confetti. I also shred all junk mail, thin card etc and store up shreddies for whelping/puppy litter. It keeps pups cleaner (re urine and poo), though I suppose if you have a white breed you may get some newsprint come off, but that doesn't seem to happen as much these days.
Only down side with shredded paper is ti does tend to travel around, but a small price to pay compared to roiling up pooey sheets of paper that pups have rolled on, and then covering you in the pooey prints, including your face as you try and clear up.
You can buy shredded clean white paper for bedding made of card
http://www.finacard-uk.com/index.php?main_page=page&id=22 often sold for horse and other animal bedding, advantage is ti saves time, and also it's usually dust extracted..