Goose's scenes in The Marvels were filmed with Brie Larson's stunt double – because she's allergic to cats

gamesradar.com:

There's not much Captain Marvel can't do; Avengers: Endgame proved she's one of the MCU's strongest heroes. But there's one thing she – well accurately, Brie Larson – isn't so great at, and that's being in the same room as a cat. 

Due to the actor's allergies, the majority of scenes Carol Danvers shares with her moggy mate Goose were filmed with a stunt double. The others, animal trainer Jo Vaughan tells Total Film magazine in the new issue out on August 17, were captured using her or one of her team standing in instead.

"We would have one of us standing in a [green or blue] suit while doing the action with the cat. We had a three-month training period," she says. "I read through the script, and marked down all the actions that the cat needed to do. These cats go onto set knowing everything that they're going to do. When we come to shoot, we break it down day-by-day. The day before we will prep what we’re going to do the next day so it's fresh in their mind."

Nemo and Tango, two orange tabbies, played feline-looking Flerken Goose, and each of them had a particular set of skills they brought to their paw-formances. "Nemo was better at running and jumping. Tango was the hero face of Goose. Whenever we did close ups, wherever possible, it would always be Tango. The naughtiest thing one of them did happened when we were on one of the sets where the ground was quite gravelly. We were all ready to go and it was just a giant cat-litter box. He didn't go to the toilet on set, but he came out and just started rolling around in it straight away. 

"The most challenging aspect of training a cat is the enormity of the sets, the huge crew, and time constraints. It's a lot for a cat. But they did us proud – as did the ten kittens."