I guess puppy mills could be called dog farming. Dogs are placed in cages, on metal wire, often crowded in with many other dogs where they await their time when they can be bred. Often the farm cages are not kept clean and the dogs live in their own filth--eating in it and sleeping in it. This is how the "caretaker" makes money. They never see daylight and lights are kept off in the "barn" so the dogs spend their lives in the dark. They freeze in the winter and bake in the summer. They are not used to being handled and many breeding dogs freed from farms are unadoptable. Those not terrified of humans often run away at the first opportunity. They get the minimum feed and often go without water or drink water that is filthy. This again is done to save the "Caretaker" money. Luckily for them, their lives are short since they are prone to chronic illnesses which lead to death. The ones who live longer but are no longer fit for breeding are often killed or dumped to run free until they are hit on the road or killed by a larger animal.
Although pet stores will tell you that they don't buy from puppy mills, they do. (This has been established by the SPCA). They couldn't afford to run their stores if they didn't. Often pet store puppies have genetic defects, illnesses, and a poor disposition. Although you might find a cheaper pup at the pet store, every puppy who is purchased this way (or through online sales) only makes room for another farm puppy to be bred, and allows business practices where dogs suffer immeasurably at the hands of careless and sometimes brutal operators who are only concerned about the money they will make.
Unfortunately, most puppy mills are still legal, as long as they abide by certain standards which require the absolute minimum of care. Because most puppy farms are unlicensed and because they usually exist in the countryside undetected, in an out building, their standards are for the benefit of profit and therefore not meeting any standard whatsoever.
Next time you drive by a farm house, surrounded by a bunch of run down out buildings, think about what could be just barely surviving in them.
Next time you want to buy a puppy online, from a pet store or from a "breeder", selling cheap, you will be making room for another poor miserable little dog to grow or exist in horrible conditions.
Don't buy a puppy. Rescue a dog. Over 5 million dogs are euthanized on this continent yearly.
The following article is a situation where, at least it appears that the dogs get to run and exercise. Sadly, it is seldom seen where these places are reported and get closed down.