Fear aggression?

[ssbon]

Hello. Sorry for this long message: I just got a second dog about 2.5 months ago for a companion for my 4 yr. old neuterd male chihuahua. She was 5 months old when I got her. The new puppy is now a 7 month old female chihuahua about 1/3(4 pounds) the size of my male chihuahua (10 pounds). The new puppy seems to have had no socialization at all. She was extremely shy when I got her as well but I felt sorry for her so I bought her from a guy that did not want her any more. I couldn’t stand her being with him since she looked really scared. She is really scared of humans still. She runs away when u are going to grab her. She has gotten better only with me, but sometimes is still a little shy with me. What can i do to make her more social and help her stop being shy and scared, because when my family comes over I try to bring her in so she can get used to them but she will bark and snap at them so I don’t put her in when we have visitors anymore? Also the main concern is that the new puppy still snaps at Lucky when she stares at him or when Lucky is chewing on a bone. She was a lot worst with lucky before though. Now they have gotten to the point to which they can be left alone together in the same room and they even share the same food cuz if I leave food out for them separately they will eat from both bowls. I believe she is doing this because she hasnt had any socialization whatsoever. What can I do to discourage the aggresiveness she has towards lucky? She doesnt bite me or my sister (she is 14 yrs.) or even growls at me or my sister. I have been working with her like checking her mouth and teeth paws etc. and will not bite or growl at me. She is also coming to me more on her own. Overall she has gotten a better improvement since we got her, but only with me because she is still a little shy with my sister and has bonded with me. She does not follow my sister anywhere. However I am in college and im only home on the weekends and my sister takes care of her then since it is really her dog and lucky is mine.. ANy suggestions as to make her social with dogs and humans and not be shy, because she will bite people I believe it is out of fear aggresion? Will she ever trust lucky and not lunge at him to try to bite him any more? The thing that im worried about the most is that she has been attacking my parents for no reason at all. When my parents pass by her crate she will bark and lunge at them. She even bites their anckles and my parents are doing nothing at her whatsoever. They just tell her “NO” but I guess that isn’t working. Also recently that I take her to my parents so they can pet her and she can get used to them, she has been snapping to get them to stop touching her! My parents also live home and I don’t want her to be aggressive to my parents since we are keeping her no matter what. Lucky does not do that to us. He is dominant over us but never bites or lung at any of us. I don’t want her aggressiveness to get any worse than what it already is. Next Saturday she is starting puppy classes. (Should she get puppy classes? She is 7 months old) I hope that will help her a little to get used to other dogs and humans since I have also noticed that she growls and barks at other dogs she sees. She has learned to sit quite well and to lay down a little also. So I hope she learns to be more obedient with my sister as well as to me also. I have not been able to potty train her to use the litter or her pads completely. She is always peeing and pooping everywhere in the house even though we have the puppy pads their so she can go on them. Any advice u can give me will be really appreciated. Thank you very much!!!