MB3 41a: Donkey, Cheresh, Shoteh or Child - Who Should You Give Your Wallet to Erev Shabbos (266:2-7)

Riding on an animal vs walking alongside it on Shabbos. The prohibition of mechamer. If you are stuck on Erev Shabbos should you put your wallet on a donkey or give it to a cheiresh, shoteh, or katan?