May 25, 2010
He is a four year old jack russell shih tzu. brought up with other dogs but we adopted him and have no other dogs. He's always been good with other dogs, now like, overnight he is agressive lunging and trying to attack dogs. He's supervised all the time and nothing bad has happened. WHATS going on?
He was neutered in May. He gets a lot of exercise but is not as energetic as a jack russel.
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