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He's actually not a purebred JRT, he has a little bit of something else in him as well. He was a shelter pup and his exact mix is still unknown but he definitely has the terrier temperament. I am aware that a lot of terrier breeds have a tendency towards aggression directed at other dogs but...

Never have used him to test aggressive dogs. Only shy, insecure or undersocialized ones. I have never seen another dog go after him; he is usually very submissive and non-threatening with new dogs.

I have a 9 month old Jack Russell who has recently been showing some pretty serious aggression towards unfamiliar dogs. I work as a trainer and he has been going to work with me everyday since he was 8 weeks old. Until just a few weeks ago he had such a stable and reliable temperament with other...