The RDR2 mod scene is a-buzzing following the PC version’s release. These highlighted ones let you play as animals.
The Model Swap mod on Nexus Mods let you replace Arthur Morgan with any number of other characters using a simple save edit. Switching to an animal lets you properly control one and make it move just as accurate as its in-game counterpart would. Birds, bears, sheep: as long as it’s in RDR2, it’s fair game.
It’s still a work in progress, but it’s pretty impressive how fast this is set up given that the game was out late last Tuesday.