I don't know how you are searching for a breeder, but classified ads aren't the way I'd go. Call the breeder and ask questions, but first look at the thread here on what to look for in a responsible breeder. Make a list before you contact them.
Things to look for in a 'Responsible' Breeder
And remember, all pups are cute, so don't be sold on a litter you fall in love with because they have that mesermizing puppy breath! Do research and don't jump into anything without thinking it all through.