Did you always have to train pets for litter box?

My dogs are all taught to do it outside. They do it when I take them out for their morning run.

I have trained some of my cats to use the bathroom to do their business. It's not really that difficult. Cats want to go after a meal and when they wake up. So after a meal and when they wake up, I lock them into the bathroom for a while. After a few days, they would start doing it in the bathroom. Then once a few of them do that, the rest would usually follow. It does make the bathroom messy but still it's less messy that finding unwanted deposits under the bed and under the cupboard.