By Joe Smith Passengers on a flight were struck with an almighty stink from a tiny dog after the owner let her chihuahua out of its crate and it pooped on an airline seat. Travellers on the United Airlines flight from Portland to Denver said a woman’s chihuahua caused chaos on the plane when she let her fussy pup out of its crate during the flight on Monday and it left a little present on the furniture. Passengers were struck by a foul “poop” smell, said one man, who identified himself only as Nick. A pregnant woman sitting directly behind the epicentre of the stench was forced to hit the call…