I'm aquarius - Rat and he is Virgo - Dog. Is this a good match?

Yes, it could be a loving pair. Both of you are friendly and mild so that there is hardly argument between you two. Besides, you can spare enough personal space for each other, which makes mutual attractions never lack in your relationship. If you cultivate more common interest and goals, you will be soul mates and the life-long relationship may happen sooner or later.