Gobi is a small, female border terrier mix dog that began following ultra marathon runner Dion Leonard at the beginning of Stage II of the Gobi Desert Run in China in June 2016.
 Some vets have now told Dion that the dog could be a mix of Shih Tzu, Pug and Chihuahua.
The Chinese Imperial Dog is a Toy dog breed with a wrinkly, short-muzzled face, and curled tail.
 Kennel clubs originally classified the breed under the shih-tzu, before recognizing the Imperial as a separate breed.
 Other names for the Chinese Imperial Dog include: Imperial Shih Tzu, Lion Dog, Micro Shih Tzu, Miniature Shih Tzu, Princess-type Shih Tzu, Tiny Teacup Shih Tzu, Tiny Toy Shih Tzu.
The Irish Wolfhound (Irish: "Cú Faoil" , ] ) is a breed of domestic dog ("Canis lupus familiaris"), specifically a very large sighthound from Ireland.
 The name originates from its purposewolf hunting with dogsrather than from its appearance.
 Originally developed from war hounds to one used for hunting and guarding, Irish Wolfhounds can be an imposing sight due to their formidable size.
Mal-shi, also known as Malshi, Malt-tzu, Maltzu, and Malti-zu, are a type of designer dog resulting from a cross between a purebred Maltese and a purebred Shih Tzu.
 Most Mal-shi are F1 crosses, as there has been little interest in developing the dog as a breed.
 They are not recognized by any major kennel club.
Marnie is a 15-year-old female Shih Tzu senior rescue dog adopted and owned by Shirley Braha.
 Photos of Marnie have been popular on Instagram and Twitter; as a result, Marnie's Instagram account has over one million Instagram followers and each of the photos have received hundreds of thousands of Instagram likes; Marnie's Twitter account has received over 75,000 followers.
 Braha also posts short videos of Marnie on Vine, which have also garnered significant attention.
The Pekingese (also known as the Lion Dog, Peking Lion Dog, Pelchie Dog, or Peke) is an ancient breed of toy dog, originating in China.
 They are called Lion Dogs due to their resemblance to Chinese guardian lions (the Shih Tzu is also known as a Lion Dog in Chinese).
The Tibetan Spaniel is a breed of assertive, small, intelligent dogs originating over 2,500 years ago in the Himalayan mountains of Tibet.
 They share ancestry with the Pekingese, Japanese Chin, Shih Tzu, Lhasa Apso, Tibetan Terrier and Pug.
Zuchon or Shichon is a hybrid breed dog or a designer dog.
 It is cross between Bichon Frisé and Shih Tzu.
A Shih Tzu (English: ; ), also known as the Chrysanthemum Dog, is a toy dog breed, weighing 10–19 pounds (4.5–8.6kg) when fully grown.
 The exact origins of the breed are unknown, but it is thought to have originated in Tibet and then been developed in China.
The Shih-poo is a small domestic dog.
 It is a crossbreed between a Poodle and a Shih Tzu.
 The name "Shih-poo" is a portmanteau of the two breed names.

Question: What is the similarity between the Irish Wolfhound and the Shih Tzu?
Answer: dog