All animals and foods have natural protective bacteria. Humans shouldn't be bathing daily. They need the bacteria and so do all the other creatures.
What ever turns your crank but iam taking a bathe every day don't like to stink.
As for my horses they just get hosed off daily in summer after being riden. Once in a great while they get a shampoo bathe. I do shampoo my geldings tail fairly often its white and gets nasty dirty.