How can I make it work with him Dog/ Virgo and me Dragon/ Leo?

To be honest, you two aren't well matched. Virgo and Leo are fine. However, Dog and Dragon can't open their hearts to each other. They both are on aleart when they get along with each other. Since both want to the be leader in their relationship, they always try to belittle each other. If one side can't tolerate, then their relationship will end.

If you still want to be together, then both should get along with each other without reservation. Remember that trust is the fundamental to a successful relationship.