Dogs at puppy mills must endure constant breeding cycles. (humanesociety.org)
Animals are forced into a life of constant breeding in cramped cages, and when they are not considered profitable, they are killed or abandoned. (onegreenplanet.org)
When they become weakened by constant breeding and cheap care, and can't produce viable kittens anymore, they are dumped at SPCAs where many are killed. (animaladvocates.com)