Serious Chihuahua breeders have spent years researching genetics and the breed, they breed only the best specimens and screen for hereditary defects in order to obtain superior puppies. Prospective Chihuahua breeders have one more worry than do breeders of most other dogs. All Chihuahuas are little, some Chihuahuas are tiny. Even if bred to a tiny stud, there is a definite risk, that any resulting puppies would be too large to be carried full term, or to be whelped naturally. Cherish your tiny Chihuahua female, but don't risk her life by breeding her. Why do otherwise sane people breed dogs at all? Ethical and knowledgeable breeders seldom do. We breed a litter only after studying the breed standard, pedigrees and individual dogs to find the most advatageous match of conformation. When we do breed, it is because we love the Chihuahua and believe that our puppies could be a worthwhile addition not only to the breed, but to somebody's life.