Sounds an alarm every 2 hours, reminding you to take the pup outside to relieve himself. After a month, you have the option to extend it to every 4 hours. After another month, every 8 hours, etc. once the puppy is house broken, you can either disable the reminder or simply uninstall the app if you don't think you'll be using it again.
The closest I've found is a prescription reminder app on the Android Market, but the minimum reminder time is daily... wtf?-- 21 Quest, Jul 08 2011random, halfbakery