The deceased lay wrapped in a cotton blanket, surrounded by white roses and hydrangea, angelic figurines and lit candles and incense. A wall-mounted screen displayed photographs of him. His 71-year-old companion, Kim Seon-ae, convulsed with tears as she bid farewell, caressing his head and face. Next door, young uniformed morticians prepared for his cremation.

The elaborate and emotional ritual was for a white poodle named Dalkong, who was nestled in a willow basket with his eyes still open.

“He was like a virus that infected me with happiness,” said Ms. Kim, who had lived with Dalkong for 13 years until he succumbed to heart disease. “We were family.”

Not long ago, South Korea often made global headlines — and raised the ire of animal rights groups — for its tradition of breeding dogs for meat. But in recent years, people here have gravitated toward pets, especially dogs. They are looking for companionship at a time when more South Koreans are choosing to stay single, childless or both. More than two-fifths of all households in the nation now consist of only one person.