I hope this is in the right category. I'm trying to help an aquaintance of mine with her Chihuahuas aggression: I have Chihuahuas myself, but they were trained and socialized at a very early age and I've never had to deal with any type of aggression from any of them. She has a 10 month old male Chihuahua. She's had him for about 3 or 4 months! He is very, very protective of her children. He will bark, growl and snap at anyone, including other family members, when they try to get near him and her children. He has already bit one person. She makes her Chihuahua (once she catches him), lie down until he calms down, while saying NO BITE. She does have to muzzle her Chihuahua. She wants to know what she can do to change this dogs behavior. Since I have never had any of my Chihuahuas show any aggression and never had to deal with this problem, I was wondering if you can all help me, with some advice I can give her. If you have any links with information that will help her, that I can pass onto her, I would greatly appreciate it. She does Not want to give this little Chihuahua up. I don't know what kind of life this Chi had before she got him and it doesn't sound like he has been very socialized. She really wants to work with this little puppy. Can you help me, help her? I would greatly appreciate it! Thank You!!!