[header] How to become a dog breeder [title] Decide what breed you will specialize in. [step] Reputable dog breeders don't breed a variety of dogs. They specialize in one, or maybe two, breeds of dogs. 
You may have a breed in mind that you particularly love, or you may need to spend some time considering which breed would be best for you. [substeps] Account for their personalities and temperaments as well as the space you'll need to house the breed depending on their size.