A pet dog is seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

A pet dog is seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

Kimono-style pet apparel is on display at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

Meerkats are seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

A cat is seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

A dog is seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

Pet dogs are seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

Pet dogs are seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

A cat is seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)

Pet dogs are seen at "Pet Haku 2019" in Yokohama, Japan, on Jan. 13, 2019. "Pet Haku", a pets and pet goods exhibition, is open to citizens with their pets. (Xinhua/Du Xiaoyi)