How to handle my aggressive dog
A little back story on my dog. We got T as a puppy. He is a St.Bernard and Rottweiler cross. As a puppy, we often took him to pet parks and on walks. While working, we kept him in a large kennel and then would walk him when we got home because he was a chewer.
When he was about 1.5 he started to become a bit aggressive so we went through a training program to help. This was pretty intense leadership training program that involved hand feeding every meal. He was getting better until he broke free from me while walking in our yard (while 6 months pregnant). He attacked the neighbors dog who would often come after him while we were on walks. The dog had some bite marks but made a full recovery. However, another witnessing neighbor shot Titan twice. He barely lived but became more fearful.
After being shot, we moved him to my parent's farm. There he had indoor outdoor access and was sometimes with other dogs. We played with him whenever we came out (several times per week). He is still very friendly with us.
We recently bought our own farm and fenced off an area for him. He has his own large garden shed. We also adopted another small Cavalier King Charles that is mostly a house dog. The two dogs know each other but do not really get along. They both like our baby but got into a fight over him and our attention the other day.
I know that banishing T to an outdoor pen will only make his problem worse, however I fear that his life depends on him not hurting anyone or any animal. I have contemplated buying him a muzzle so he can get used to the other dog and be safe around my baby. I can bring him in to our laundry room at night to sleep, but then put him out when the other dog is inside. I would love to rehome him because he is a great source of worry for me, but I know he would be euthanized. I often worry so much about him I can't sleep and get headaches.
As far as more training, we have already put thousands of dollars into this free dog that still cannot be trusted. Any ideas for how to make is life less miserable while keeping everyone else safe?