My last dog had fear aggression. Has she bit anyone? It was horrible for me, most of the time you could see it coming, but sometimes I was not quick enough. He would woof low, not bark, circle the person and then bite them in the a$$. Usually overweight strange men. Keep an eye on that. I wish I had a trainer help me with that.
She hasn't bitten anyone yet. Here is what she does:
1. She barks and lunges at people *sometimes* during walks, and I'm trying to counter-condition with treats (I have her look at me before she reacts, click, and treat). She has done this before and after her spay. If the person has a well-behaved dog on a leash, she couldn't care less about the person. She loves dogs.
2. I've brought her to my office a couple of times and when someone comes in, she'll low growl until I tell her to quit or until I "introduce" her to the person. My tall male coworker walked in one morning like he owned the place---because he did---while she was lying beside me and she jumped to her feet barking and jumping like she was in full panic mode (hackles way up). I had her come back to me and lie down, and she calmed down but she stared at my coworker until he left (he had just come in to print something).
That same day, she had posted herself at the office door, keeping watch. A tall male coworker passed by and she growled at him, and he stopped and looked at her and talked to her, and she didn't run away but stood there, hackles up, growling at him. There was a baby gate between them. As soon as he walked away, she REALLY lunged at the baby gate as if she wanted to get at him. I yelled "No" and she came back to me. After that, I prohibited her from posting watch at the door and made her stay beside me.
This was 1 week after her spay.
3. One morning on a walk, a neighbor lady came up to us and put her hand out for Willow to sniff. She did, and didn't bite, but it was clear she didn't feel comfortable. The moment the lady turned to walk away, Willow jumped forward and snapped at her back (didn't touch her but her intentions were clear). I immediately corrected her, told her "No" and had her sit and look at me. That one was only 4 days after her spay.
So yeah. Probably fodder for another thread, and I have talked about this in another thread....and we've had 2 sessions with a trainer (before her spay). I had houseguests over for a weekend, 5 days after the spay, and she was mostly fine with them, though I could tell she was stressed when they were moving around the house. The initial introduction (outside on the lawn) was a little tense. She did the same snapping at their backs a time or two when they would get up to leave, but when they were sitting on the couch she was happy to let them pet her and give her treats. She does snap at my hands sometimes but usually when she's excited about something (I've never felt it's because she's being aggressive).