The dog was showing signs of hypoxia.
The crew was able to bring the dog, named Darcy, an oxygen mask.
This happened during a flight from Florida to Massachusetts.
One flight attendant owns a French Bulldog and says he has never seen anything like it in his 15-year career.
JetBlue released the following statement:
"We all want to make sure everyone has a safe and comfortable fight, including those with four legs. We're thankful for our crew's quick thinking and glad everyone involved was breathing easier when the plane landed in Worcester."