Well, I got a dog 3 months old, and he also was like ''I'm gonna pee wherever I want and just watch me do it''. So we started to took notice of a time when he was doing it and take him outside to do it. Sometimes he would pee when taken outside, and sometimes he wouldn't.
When he would pee inside the house he would get a 'yelling treatment' when you yell at him ''WHAT DID YOU DO! HOW COULD YOU! LOOK AT THIS!'' showing him the place where he's done his bad thing. XD
But, he was stubborn, until he got a spanking of his life mixed with 'yelling treatment'. After that he was doing it outside for life. XD

Same with shitting. XD

Now he begs to go outside when he feels the need.