Well, this is a broad topic. You should give more information.
From what you say, it could be something physical so take it to the vet just in case.
But I think this is more of a behavioral concern. If the dog is in a crate, it's probably because he is disobedient in a certain aspect.
If the dog lacks discipline you'll get this kind of problems, like destroying furniture and some other weird behaviors.
You should train, a lot. At that age, he should be doing his things outside, not struggling to use a mat.
A significant amount of time, measured in lots of hours, needs to be invested in walking your dog on the streets outside and socializing it with other dogs. When a dog does not behave instinctively (and drinking urine isn't aligned with their instincts, because they love smell marks) it's because something is not quite right on his daily basis.
Judge yourself and, if you can't or you don't know how to do it, contact a professional. You are probably the only one guilty of that behavior.