Final answer:
UKC breeders are encouraged to plan breedings with the aim of improving the breed, focusing on the health, genetic diversity, and welfare of the dogs while avoiding detrimental practices like inbreeding.
Step-by-step explanation:
UKC breeders should plan each breeding with the paramount intention of improving the breed. This encompasses breeding practices that strive for the overall health, genetic diversity, and positive traits of the dogs, rather than other motivations such as maximizing profits, producing show champions, or increasing breed popularity. The examples of selective breeding strengthening undesirable traits in English bulldogs, Dalmatians, and pedigreed cats illustrate the complexity and importance of responsible breeding. Breeders avoid practices like inbreeding as it can lead to fatal mutations and a decrease in genetic diversity which affects the breed's health and viability. Responsible breeding practices contribute to the health and sustainability of the breed, thereby upholding the breed standard and ensuring the welfare of the animals.