Are you sure your child even wants a dog? - or are you getting it because you want the dog, or because you think your kid should have the experience? Or if they do want the dog, do they have realistic expectations when it comes to caring for it? Do you realize that you'll most likely be the one who has to walk the dog every frosty morning and feed it? Are you okay with that? Do you know that winter may not be ideal for adopting a puppy, seeing as some of them may prefer to do their business on a nice warm carpet rather than out in the chilly yard? Oh, the questions you must ask yourself.
Personally, I'd wrap up a few doggy knick-knacks like a leash and and dishes - much easier to return, just in case, than a puppy - and let the kid draw her own conclusions. Then she can pick out her own best friend once the holidays are over and things have gone from 'manic rush' back to relaxed. And it would be great if you can nudge her in the direction of a shelter: there are plenty of kids out there who'd be happy to open their hearts to a homeless dog, if you explain the idea to them. Hey, you might even end up with someone else's discarded puppy, and give the little guy a second chance at finding his forever home.
I'm such a Linus. I gotta stop preaching and come up with some happier posts!
*If I were a sex-ed teacher, I wouldn't be the sort to advocate abstinence only and then pass around the chastity belts. You know some of those kids are gonna be doing it anyway, so you may as well make sure they're armed with condoms and the right kind of knowledge, says I.