I am Sheep and my sister is Dog. Are we a good match? We argue and fight alot.

According to Chinese zodiac signs, a sheep and a sheep do make a tricky match. Perhaps, because of that, you argue and fight a lot. But it would not last for long. You and your sister may have totally different personality and hardly have any common interest. Thus as long as you can bear each other more and try to spend some time on communication, it would be better. Besides, if you cultivate the same hobbies or interest, your relationship would be more harmonious. Just have a try!
Good Luck!