WMAQ reported that the handler then contacted the company Johnson works for, which she said shipped the animal and typically sends K9s through United.
Johnson said she tweeted the image to prompt a response because,"No company wants anything taken to social media," but she would not say what company she works for.
"We are continuing to review this and have confirmed that the dog is unharmed," Erin Benson, a spokeswoman for United, told WMAQ in an email. "We are attempting to contact the owner to follow-up. At United, we are committed to providing the ultimate in safety and care for animals traveling with us."