A 1994 Time magazine article on the effects of over breeding reported that as many as 25 percent of the 20 million purebred dogs in the US are afflicted with a serious genetic problem.

• 在1994年的时代杂志上的一篇关于过度繁殖所造成影响的文章中，指出在美国的两百万只纯种狗中，有百分之二十五的狗遭受严重的遗传疾病所苦恼。