A woman has filed a $1.1 million negligence lawsuit after her 5-year-old daughter was mauled by a pit bull — which was being used as an emotional support animal — at Portland International Airport when she petted it.

Mirna Gonzalez and her children were waiting for an Alaska Airlines flight to Texas on Dec. 18, 2017, when she stepped away to grab a coffee, the Washington Post reported.

While she was away, Gabriella asked if she could pet the dog, which suddenly bit her in the face and left her bloodied.

Gonzalez is suing the dog’s owner, Michelle Brannan, Alaska Airlines and the Port of Portland, alleging that the pit bull was let into the airport without a carrier.

The suit claims Brannan should have known that her dog had “vicious propensities.”

The pit bull severed Gabriella’s tear duct and disfigured her upper lip, leaving a piece of it missing, according to a graphic photo that the family’s attorney Chad Stavley provided to the paper.

She was left with permanent scars after undergoing tear-duct surgery, he said, adding that he plans to probe whether the dog was a legitimate emotional support animal.

According to a December 2017 report from KATU 2 News, the dog was quarantined at an animal shelter for 10 days after the incident, and Brannan was cited by police for failing to crate the animal.

“There’s a lot of abuse of this emotional support animal situation,” Stavley said, “and folks who have legitimate service animals — people who are blind and need guide dogs and the like — are kind of getting thrown into the same boat [as emotional support animals]. It shines a poor light on those folks.”

Brannan, who claims that it was, did not respond to a request for comment by the paper Wednesday night. The Port of Portland declined to comment, citing the pending litigation.

In a statement to The Post, an Alaska Airlines rep said: “We’re heartbroken by this tragic and disturbing incident and remain very concerned for our guests’ condition. We are not able to comment on the case given it is pending litigation.”

Stavley said he hopes the lawsuit will prompt airports and airlines to enforce policies regarding emotional support animals that most created in response to similar recent cases.

New rules also target fraudulent emotional support animals or service animals — house pets disguised as helpers.

In June 2017, an emotional support dog bit a man in the face aboard a Delta Air Lines flight out of Atlanta, leaving him with 28 stitches.

In February 2018, another emotional support dog bit a girl’s forehead on a Southwest flight departing Phoenix, leaving her with only a scrape but sparking a panic.

Alaska Airlines was among the airlines that changed their policy on emotional support animals last year.

According to its new rule, people must keep their dog or cat — the only animals allowed on board — in a carrier or on a leash at all times and provide 48-hour notice before their flights.