My girlfriend and her two other female friends are moving into a small apartment about 2 blocks away from our university. Our area has had it's share of muggings, armed robberies, and assaults, and I was wondering if there was any way of fortifying a small 1 bedroom apartment for prevention against unwanted intruders. I'll be in that apartment a lot, helping out with the chores, cooking, and to make sure the girls are okay, but for those times I'm not around, is there any way to fortify a small apartment like that. My first choice would be a good dog, which would serve as a guard-dog, but the landlord doesn't allow pets. Any tips would be appreciated. Thanks!