The term "backyard breeder" refers to people who engage in the practice of breeding animals, particularly dogs and cats, without following proper standards or guidelines. These individuals may not have any formal training in animal husbandry or genetics, and they often do not screen their animals for hereditary diseases before breeding them. As a result, backyard breeders can contribute to the propagation of genetic disorders within certain dog breeds, as well as overpopulation issues due to irresponsible breeding practices.