Goose is a Flerken and the former pet of Mar-Vell. Following the death of her owner, Goose went with Carol Danvers and Nick Fury in space, during their quest to find Mar-Vell's Laboratory. After saving survived Skrull refugees and protecting the Tesseract from Starforce and Kree soldiers, Goose was responsible for permanently blinding Fury's left eye with her claws. Despite what happened, Fury opted to take care of Goose after Danvers left Earth.
In the comics, Chewie is the name of Carol Danvers's cat. It is the last member of the Flerken race, beings who hold pocket dimensions in their mouths.