Photo taken on Aug. 21, 2019 shows guide dogs at the 22nd Pet Fair Asia 2019 in Shanghai, east China. The five-day pet fair kicked off Wednesday in Shanghai, attracting more than 20,000 brands from over 1,600 exhibitors in pet industry. (Xinhua/Ding Ting)

Customers negotiate business with exhibitors at the 22nd Pet Fair Asia 2019 in Shanghai, east China, Aug. 21, 2019. The five-day pet fair kicked off Wednesday in Shanghai, attracting more than 20,000 brands from over 1,600 exhibitors in pet industry. (Xinhua/Ding Ting)

Photo taken on Aug. 21, 2019 shows pet supplies exhibited at the 22nd Pet Fair Asia 2019 in Shanghai, east China. The five-day pet fair kicked off Wednesday in Shanghai, attracting more than 20,000 brands from over 1,600 exhibitors in pet industry. (Xinhua/Ding Ting)

Photo taken on Aug. 21, 2019 shows pet supplies exhibited at the 22nd Pet Fair Asia 2019 in Shanghai, east China. The five-day pet fair kicked off Wednesday in Shanghai, attracting more than 20,000 brands from over 1,600 exhibitors in pet industry. (Xinhua/Ding Ting)

Photo taken on Aug. 21, 2019 shows pet supplies exhibited at the 22nd Pet Fair Asia 2019 in Shanghai, east China. The five-day pet fair kicked off Wednesday in Shanghai, attracting more than 20,000 brands from over 1,600 exhibitors in pet industry. (Xinhua/Ding Ting)

Photo taken on Aug. 21, 2019 shows guide dogs at the 22nd Pet Fair Asia 2019 in Shanghai, east China. The five-day pet fair kicked off Wednesday in Shanghai, attracting more than 20,000 brands from over 1,600 exhibitors in pet industry. (Xinhua/Ding Ting)