The cat held by Marlon Brando in The Godfather was a stray Francis Ford Coppola found while on the lot at Paramount.
A cat was not originally called for in the script — but as we can all attest — worked out very well.
It’s alleged that its loud purring muffled some of Brando’s dialogue — at times drowning out the Don’s voice — but sound experts fixed all that — back at the studio.
The use of the cat in the scene has later been interpreted by some (not me) as representing the hidden claws beneath the Don’s warm facade.
The Godfather CAT probably didn’t get royalties for an excellent acting job but I hope it (gender?) was at least adopted.