Question about wood floor refinishing... Damn animals!

Well I have decided that moving into the master bedroom is a must now. We have lived in the small guest bedroom ever since we moved into our house. The room is painted and livable, but the question I have is, "What should I cover my floors with?". I know a lot of people would sugguest polyurethane. And I bet that is a good solution, but listen to me first. I have 5 dogs, ranging from 3 tiny chihuahuas and 2 big black labs. They do a number to my floors everyday and with poly I am afraid that I will have to refinish every few year. I know the plus side is that it is very durable, but then the bad is that you can not fix it after it has been damaged. I have read a lot about shellac and have written a few things about it on my blog. The plus is that it is easy to spot repair and dries a lot faster, the bad is that it is easily damaged. I won't even go into the n-th number of other floor finishes either. So if you could please put your input on what I should use. I will take what you say and make my decisions.

Remember: I do have to stay in the house as the floors are being refinished. Please help. Thanks so much.