Airport spokeswoman Lisa Mulitalo told stuff.co.nz that Grizz was killed as an absolute last resort.

“They did everything they could, but unfortunately the dog had to be shot,” she said. “We’re really upset about it.”

Nicky Thorburn, the son of handler at the time Grizz broke free, took to Facebook urging sympathy for his father, Noel, a customs officer reportedly with 30 years’ experience.

“It was a last resort, my dad is very upset about this,” Nicky wrote.

“I’m reading disgusting comments … and people need to understand how traumatising and upsetting this was for him.

“Please have compassion.”

Around 75 per cent of 28,000 readers in a poll on news website stuff.co.nz felt more humane methods could have been used, while many on social media were more emphatic.

“I’ve been waiting for a legitimate reason to start a ‘Boycott New Zealand’ campaign,” @SubParLover wrote on Twitter.

@SeaTurt1e “WTF, New Zealand? No other option? The only one in danger was Grizz! He deserved better.”