Colbi's aggression has gotten better. I've begun to learn exactly what is causing his aggression, and have learned to help him to not be so... His only real aggression is out of protection. He protect the car and me!

So I've learned when someone new approaches the car or me and they wish to get in or pet him. I asked them to wait so that I might introduce him to them. and It works! If I am letting someone into the car, I first take him out of the car or hold him back while they get in. Than introduce the person to Colbi and he seems to understand what is happening. I did this with a good friend of mine that likes and understands dogs. He was very aggression when she approached the car. But held Colbi back, she got in. I told him it was ok, and that my friend was nice. Within about 5 minutes he was panting on her lap cuddling her. It was rather cute!
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Momma, Dadda, Juliet (Calico), Buddy (Tabby), Lima (Siamesse Mix), Colbi (Jack Russell), RJ & Billy (Bearded Dragons), SweetPea (Midland Water Snake), Three Parakeets, and the 20-Gallon Bowl of Fishies