Dog food.
Tinkerbell
extremely, shoot on sight
Probably anything bigger than a chihuahua.
Chihauhaus usually attach themselves to one person, which means they will usually attach themselves to the person that feeds them and spends the most time with them. To them, everyone else besides that one person doesn't matter.
humans have not only tamed dogs, but we have bred them to the many different species we see today. chihauhaus are small because we only breed the smallest of the litter, while great danes are huge because we only breed the largest. it is the same for the different features and colorings. we, essentially, evolved dogs to be the ones we know and love today.