And there is no remedy quite like Ollie, a six-year-old goldendoodle therapy dog who is helping children at Rady Children’s Hospital in San Diego overcome the anxiety associated with getting a Covid-19 vaccine.

Ollie and 14 other dogs of the PetSmart Paws for Hope Canine Therapy Programme have been helping kids aged five to 11 ever since they became eligible for the vaccine earlier this month.

Across the United States, adults are resisting shots out of mistrust stemming from how quickly the vaccines rolled out, questions about possible side effects or, in many cases, fear driven by spurious rumours.

Children are just afraid it’s going to hurt.

The anticipation of a jab at Rady’s vaccine clinic had nine-year-old Avery Smith in tears. Then Ollie came in and sat at her feet.

Avery’s mother, Kelli, took a picture of her with the dog and Avery’s six-year-old sister, Olive.

“It helped me because I never had a Covid vaccine before and I didn’t know what it felt like. But when I saw the dog it helped me calm down,” Avery said.

Before the vaccine, the dogs already had a job bringing joy to patients admitted to the children’s hospital, many of them battling cancer or other diseases that can sap morale of patients, their parents and hospital staff.

“Sometimes a parent will say, ‘He’s asleep from his surgery, but can I pet the dog?'” said Ollie’s owner, Kristin Gist, 75, a canine therapy volunteer and former hospital programmes director.

“They can really cuddle with the dog and feel better, too.”

When Covid restrictions hit early last year, some 20,000 annual canine visits came to a halt. They restarted about three months ago.

“There was nothing. It was silent. The kids were bored,” said Carlos Delgado, a hospital spokesperson.

“So thank God we were able to start bringing the programme back. Even a three-minute visit with a canine makes a difference for the day.”