When a relative comes over is it normal for them to bring their pets? 

I don't think that it is normal.  I am having an issue with a cousin of mine over this.  She has a yappy poodle.  I have a German Shepherd and a cat.  I would have to lock my pets up or they would kill hers.  My cousin wants to come and stay for two days. 

Would it be proper guest etiquette for me as the host to lock my pets in the basement or just absolutely forbid her to bring her dog?