Horse Man & Rat Woman
This marriage will not be a happy one. They will easily get angry at each other. The end result is that they are not together spiritually even though they still look like a couple. There will be disasters. Their relationship will be short lived.
Rat Man & Horse Woman
This relationship should be avoided. They are both irrational, crazy, and blind. They will do unfortunate things such as divorce. This is not good for their children.
(Source: Love & Luck in the Year of the Dog)