Thanks guys for all the input. I have been out of town and haven't been able to get to the computer until now. I was planning on using the disposable ones for the acutal whelping and then when the puppies get bigger the reusable ones for their pen. I have in the past taped down the disposable ones on our tile floor to keep it clean, but hate throwing all that away everyday. My puppies are due the end of Jan. and am so looking forward to little paws around here.