シーズー
One theory is that the Shih Tzu descended from a cross between the Pekingese and Lhasa Apso.&lt;ref name="Clark/Brace"&gt;&lt;/ref&gt; The dogs were favorites of the Chinese royals and so prized that, for years, the Chinese refused to sell, trade, or give any away. The first dogs of the breed were imported into Europe (England and Norway) in 1930 and were classified by the Kennel Club as "Apsos". The first European standard for the breed was written in England in 1935 by the Shih Tzu Club, and the dogs were categorised again as Shih Tzu. The breed spread throughout Europe and was brought to the United States after World War II, when returning members of the U.S. military brought back dogs from Europe and Asia, in the mid-1950s. The Shih Tzu was recognized by the American Kennel Club in 1969 in the Toy Group.