My Jack russell terrier Mix dog named diesel..

by Cathy
(Hamilton Ontario Canada)

Recently my niece got another dog,a Boston Terrier 8 months old...Diesel(who was my neice's dog til I bought him from her))doesn't get along with Roco the boston terrier..I have to keep diesel in a cage because of his not getting along with the other dog...Diesel sees the need to become very agitated & has attacked Roco twice...Diesel was abused by his former owner... What I want to know is because of diesel being abused would this cause him to become mean & attack anyone? I'm afraid he will end up hurting or killing another dog or Roco will kill him if he attacks him again...I need as much information to determined whether I should have him "put down" or not... I thought all Jack Russell Terriers got along with all dogs...

Please HELP!!!