. >> reporter: kelly e. cart certificate founder of the jet set pets.com. carter says stories like janet's show flying with pets is risky. >> people have to really stop and really think about it long and hardsome it worth it for me to check my family member as baggage? >> she was in icu for three days. >> reporter: a vet diagnosed sedona with heat stroke, a urinary tract infection and liver problems much the total bill, more than $2700. >> such a good girl. >> reporter: sinclair wanted united to pay for it but the airline argued the dog had a pre-existing condition even though she received clean bill of health prior to the trip. >> they would give me $1,000 if i signed a non-disclosure agreement. >> reporter: sinclair refused, instead going public, creating a facebook page called united airlines almost killed my greyhound, which now has thousands of supporters. the next day united offered to pay the entire bill but still required the non-disclosure agreement, which is standard for all settlements with the airline. >> the only reason i can do this interview