Yes chihuahuas are very protective. Baby won't even let a stranger hug me or she goes crazy. Even if somone makes a sudden move at me like amoncio or my brother she goes off on them. When I have company and she is sittin in my lap and they come close to me she growls like crazy and gives them the EYE LOL is what I call it anyways. Yes they are very protective of there homes and there people.