This is due to individual pet guardians not spaying / neutering their pets (accidental breedings), individual pet guardians breeding their pets on purpose and thinking it is OK because (1) they have a «purebred», (2) because they think that their pet should experience motherhood, (3) because they think that their children should witness the miracle of birth, or (4) because they think that they have such an exceptional pet; and also because of puppymillers and irresponsible breeders. (spotsociety.org)
SCMR wanted to prevent as many as possible from being bought by other puppymillers, so they could retire and live as companion animals, not breeders. (scmradoption.com)
This is due to individual pet guardians not spaying / neutering their pets (accidental breedings), individual pet guardians breeding their pets on purpose and thinking it is OK because (1) they have a «purebred» (2) because they think that their pet should experience motherhood or (3) because they think that they have such an exceptional pet and also because of puppymillers and irresponsible breeders. (spotsociety.org)