French bulldogs wearing tutus have delayed a flight from Gatwick Airport.
A number of emotional support dogs were travelling in passengers' hand luggage on a Norwegian Air flight destined for Austin, Texas.
The Boeing 787 had been due to depart at 11:00 BST but was delayed by an hour and a half.
A spokesman for Norwegian Air said the captain decided to offload the "distressed" dogs and their owners.
Norwegian Air said emotional support dogs, for people with mental or emotional disability, are allowed on direct flights to and from the US, excluding flights to the UK.
Pictures on social media showed the dogs being carried in holdalls and wearing tutus.
"The safety and security of our passengers and crew is always our number one priority," the Norwegian Air spokesman said.
"Flight DI7181 from Gatwick to Austin had not yet departed when the captain took the decision to offload emotional support dogs and their two owners at the gate due to the dogs showing signs of distress in the cabin."