1. there is no such thing as a breeder who is breeding mixed breeds.That's not a "breeder". That is someone who is looking for a fast buck from an unsuspecting person. The shelters are so full of these that it's sad. They are being destroyed daily due to such irresponsibility. They make it hard on responisible breeders of purebred puppies who do everything possible to keep from overpopulating the pet community.
2. The best way to house break a puppy is to have the older dogs teach it. If yours is a single dog home, a crate may be the best way to go. Please talk to someone who knows what they're doing, not this "breeder", for advice on crate training. I found a technique that has worked for me. When my puppy poops, I don't scold or spank for reasons already answered in this forum. Just take the poopy out to the place in the yard where you DO want the puppy to go, take the puppy and say POOPY OUTSIDE! in a really happy voice and reinforce that this is a good thing to poop outside. When you do catch this poopy in the house, on your way to your poopy spot, take the pup's paw and gently scratch the door then go do your happy poopy thing. Try not to lose your patience and you will train him/her to go to the door and let you know this is time to go to the spot. Good luck