Eudora, there are some places which raise lots of puppies to be sold in petshops or exported to other countries. Sometimes not much care is given to the animals because the main aim is to profit by making money. In those cases, conditions & vet care for the dogs & puppies may be very poor. These places are called puppymills in the US & puppy farms in Australia. Animal welfare authorities try to track down the places that don't care for their animals & rescue the poor things. So it's important to have laws that allow the authorities to do this.
Pet lovers can help by asking to see where puppies they are buying in petshops have been born & raised.