everyone meet scrappy

I am not a breeder and would never call myself that. I did however have a litter and sold scrappy to this family and told them if they ever needed me to call and they listened. Our two males are outside but they do come in. Its a mad house when they do lol  we also have three male chihuahuas that dont like brutus very much so we have to keep them separated.

My babies are very important to me and I am going to basically re program scrappy. He was not crate trained and if he doesnt want to go somewhere hes not going (On leash or off) He walks will harness okay but we will be working on it as well. They main problem is they used a shock/training collar on him and I do not know if this is the reason but he is very skittish of any loud noise or another dog growling ect (because of their other dog attacking him). If you have any suggestions to helping this dog not be so scared, I am open.  He was taken to the vet and I believe well taken care of but Still kinda skinny(I am guessing it was because of the stress from the other dog and probably misuse of the training collar. I hate them things.