miranadobe
Posted : 11/9/2010 10:24:46 PM
You seem set on already knowing this is a random thing. I want you to understand that in general, barring a medical condition, "random acts of aggression toward people" is an indication of a serious mental imbalance in a dog who has been highly and effectively socialized. By insisting this is random, rather than finding the body/circumstantial cues that lead up to these instances, you're essentially telling the world you have a mentally imbalanced dog. I don't think that's what you mean to do, and I think if you can have a serious, well-regarded behaviorist watch your dog under a variety of circumstances, they can help you see the body language she is presenting and can tell you if she is fearful or not, and if her behavior truly is "random" and aggressive. This sounds like, as Jackie said, a fear-based aggression. Since you trust and highly regard the trainers at the facility you used before you moved, call them and ask for referrals to a behaviorist in your area. You might be surprised to know that good trainers have a network of contacts across the country and they can refer clients who have moved hundreds and thousands of miles away. (I'll repeat, we're assuming you've had a thorough check up with your vet already.)
hanababy
She will be submissive and allow a person to scratch her stomach and the next moment be aggressive. She is certainly not a fearful dog.
This right here is a contradiction. If she feels the need to be submissive, she may not actually be offering her stomach for rubs. She may be offering it as just submission and the fact that the person doesn't go away and "invades her personal space", she turns "aggressive" may be an indication that she really doesn't want a belly rub. Just an alternate perspective to consider. Ultimately, with an infant in the house and a dog showing aggression toward humans, you need a professional, not an online theoretical brainstorming session.
hanababy
I think the first time she acted this way was at a family picnic when she was about 9 months old. This was understandable in that she was on a leash and there were a lot of people coming at her with one person being extra assertive. I would have done the same thing.
PS, this is right smack in the middle of a second fear-imprint period for most puppies. She may have learned that when she's overwhelmed by people invading her space, this is how to get them to back off.