X2 on the chihuahua issue, and I'd like to add that in my experience, the beliefs that lead a person to raise a chihuahua or any other animal in such a manner, or any dysfunctional manner, will also impact how they raise all other species they keep.
The very most human-aggressive chickens I ever got were from a woman who carried around a thing barely identifiable as a chihuahua, something was seriously wrong with it so it basically looked like a dead rat, and it spent all its days being either carried around or mauling her and her children. This alone should have been a warning sign to me but I was new to chickens at that point.
I have since learned that the breeder's philosophy has long-reaching impact on the animals you buy from them, so best to talk with them in-depth to find out their beliefs regarding animals, so you get a good picture of what they are shaping their animals into. If your beliefs don't match theirs, no matter how good looking the animals, it's often just a waste of time to buy from them... Depending of course on how much time you're willing to put in to correct them to your ideal.
Best wishes.
