Airlines lose a lot of things, but this one might top the list.

A woman was separated from her pet dog when they had to take different flights.

The woman ended up in Phoenix, where she was supposed to be but the dog wound up in Ireland.

United Airlines says they are not sure what happened.

"It was like somebody took, I mean a lot of people will say otherwise, but it's like somebody took my child and sent it to Ireland, I mean it feels like you got punched in the stomach," said Meredith Grant, lost dog's owner.

The dog was immediately put back on an international flight back home. He arrived in Phoenix the next day, unharmed.