Here's why:
* Physical maturity: Yorkshire Terriers, like many small breeds, reach sexual maturity early, but they don't fully reach their physical maturity until around 2 years of age. Breeding before this can put a strain on their body and potentially lead to complications during pregnancy and labor.
* Psychological maturity: Dogs need time to develop emotionally and learn to be responsible adults. A younger dog may not be ready to handle the demands of motherhood, leading to stress and potentially neglecting puppies.
* Health considerations: Breeding a Yorkie too young can increase the risk of health problems for both the mother and the puppies. It's important to wait until the dog has had time to fully develop and is healthy enough to safely breed.
It's crucial to consult with a veterinarian and a reputable breeder before breeding any dog. They can provide guidance on the ideal age for breeding, as well as health testing and other factors that ensure the well-being of both the mother and the puppies.
Remember, responsible breeding is crucial for the health of the breed and the welfare of individual dogs.