It helps. I had very moody American Pitbull Terrier that looked like a Chihuahua when he was a baby and he was already food aggressive and territorial. If I was not mistaken he was probably taken out his litter because of his behavior. I remember a lady approaching my little sister and asking her if she wanted a Chihuahua puppy and my sister had barely said yes and like magic that lady was GONE, nowhere to be seen.My parents were upset. At the vet the doctor said he was no Chihuahua but a Pitbull terrier. He was quite aggressive with our other dog and he would growl even at us just by watching him eat. This was brought up to the vet who suggested early neutering. My boy (he became mine) always remained a bit moody, was never able to share food, or socialize with other dogs besides the one we had but he definitely did mellow down and became a sweetheart with me and family. He kept to himself and didn't attack dogs or barked at them he just didn't want them close.