cats

There is no milk in soy milk.

I know cats are lactose intolerant, yes. That's why we're talking about soy milk instead. Thanks anyway.

They cannot digest milk for the same reason as humans that are lactose intolerant. Non-dairy milk is a whole other thing, with their own concerns for health effects on cats.

Learn the difference between what actual milk is and what soy “milk” is. They are not the same.