I think a lot of people who interact with dogs in a regular basis will disagree too. My girlfriend has a little female Chihuahua, and even though I never feed h

I think a lot of people who interact with dogs in a regular basis will disagree too. My girlfriend has a little female Chihuahua, and even though I never feed her she will go crazy every time I enter the house. Why would she do that if I'm not a food source?