Dragon Man & Ox Woman
They can not have a happy love life. They will both want to cal the shot. He will feel very unhappy. There will be a lot of anguish.
Ox Man & Dragon Woman
There will be a lot of skirmishes or clashes. This is because Dragons like to show off while Oxen do not believe in anything that is vain. They will have to part before they get old.
(Source: Love & Luck in the Year of the Dog)