Now, in the example I gave you, humans were acting as the selective agent, selecting which dogs would breed and which wouldn't. (religion.blogs.cnn.com)
If the female dog has bred, puppies will arrive in approximately nine weeks. (second-opinion-doc.com)
Ethical breeders will do everything in their power to ensure that dogs they've bred don't end up in a rescue centre. (breedingbusiness.com)