Hmm... okay, that's good since I already have about 8 bags of play sand (we were going to use it in a landscaping project last year and never did). Their fur is so curly I think this is going to be a nightmare, but it's all worth it for them to have fun!
(I also seem to remember that some kinds of mulch are dangerous to puppies and I'd hate to endanger them with harmful chemicals.) Thanks.