Dog trainer, Sabine Wolff, and her dog give a "Flying Dog" performance during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A girl interacts with a little Maine Cat during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Bengal Cat is seen during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A hound is seen in the "Diving Dog" competition during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

Dogs are seen in the "Flyball" competition during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Bengal Cat is seen during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

Cora Czermak from Germany attends the "Dog Dancing" competition with her dog Steps, a Papillon, during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Jack Russell Terrier is seen in the "Diving Dog" competition during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Saarloos wolfhound is seen during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A girl and her dog perform during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Basset Hound is seen during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Berger Blanc Suisse is seen during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Jack Russell Terrier is seen in the "Diving Dog" competition during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

Cora Czermak from Germany attends the "Dog Dancing" competition with her dog Steps, a Papillon, during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)

A Jack Russell Terrier is seen in the "Diving Dog" competition during the Hund and Katz exhibition in Dortmund, Germany, on May 19, 2019. The three-day event hosted by German Kennel Club, presents dogs and cats of more than 200 breeds from around the world. (Photo: Xinhua)