Zoey was never a timid dog, she never shied away from strange people or dogs, but some places/situations you could see a heightened awareness, maybe she needed more exposure than her litter mate Tuke? Tuke was at ease wherever she was, everyplace was a playground to her. Zoey was a target on a few occasions during training class, being attacked from behind, never much physical damage, mostly a loss of butt tuff hair. She may have developed some dog aggression from these events and it landed her in the "naughty dog" class, not what it was called, just what I used jokingly. She did well and got a lot from that class, but she still seemed on guard around other dogs, never fully at ease around them. We decided to take a break from training classes and just work with her at home, parks etc...
A year plus later I enrolled her in rally, she's done this before, but thought it would be good to get her around dogs in an activity she was familiar with and Wow! What a changed dog, she walks in with confidence and excitement. I have to get her to contain herself a bit as she will bounce around me going from a "front" to an "around" heal, looks like an impala, lol! I love it. The trainer, who knows Zoe, was impressed with her enthusiasm, she told me "what a different dog".
The one thing I've done differently was taking Lucia's (Castlemaid) advice on working with the flirt pole. Zoey would not release after a few rounds. We started letting her "win" and parade around with it for a bit. We transferred this to fetch when she wouldn't cough up the ball and we also looked at other situations where she could be the "winner" and I think this has been a huge part of her transformation. She looks at me during class and though she has had a dog growl at her, there was no lasting effect, she just turned back to me and went on with our training as if nothing had happened.