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Definition of puppy mill
: a commercial farming operation in which purebred dogs are raised in large numbers and often in substandard or poor conditions
Currently, hundreds of thousands of dogs languish in puppy mills, large commercial breeding operations that supply most pet stores across the United States and contribute heavily to the pet overpopulation problem. — Dog Watch
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Time Traveler for puppy mill
The first known use of puppy mill was in 1953
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