Dude, in 1971 my dad 's friend had some buddies on the STL police force and I got to visit the Cards dugout prior to a game and met Lou, Jose Cruz, Torre, etc. The dugout was on the first base side.
There are no standards for what side the home dugout should be on. The home team gets to decide which side to place it on and it is usually for the convenience of the home team. An example of this is placing the home dugout on the opposite side of where the sun shines during day games.