Hey guys I really need some advice. I have a dog that is very high prey instinct and I am not sure what to do about it. It have gotten really bad in the last year or so. He is a fixed male lab cross that is 6years old.
He got the mail carrier today that was across the street and broke skin. I really don't want to put him down if there is another option. Please help me cause I am very concerned about this.

This was also not the first time this has happened.
I realize that it is my fault and want to take every precaution that I can to make sure that this never happens to anyone again.