Private jet holidays, cat litter boxes powered by artificial intelligence and human-grade fresh dog food inspired by char siu rice are all the rage at this year’s Hong Kong Pet Show, as exhibitors express confidence in the purchasing power of the city’s pet owners. Humans, dogs and cats jostled alongside each other on Thursday, the opening day of the expo at the Hong Kong Convention and Exhibition Centre, as furry friends decked out in outfits sampled treats like dried alligator and bully...