So, I have a medium sized brindle puppy rescue (that I've had since 8 weeks), she's about 40lbs and her second birthday is coming up very soon. And we've had very few problems her entire life.
We used to go to the dog park every single day for maybe the first year of her life, where we almost had a good time and we always left at the first sign of conflict (which I think I'm very good at reading, I've done lots of research and got to put it into the practice at the dog park for a long time). She never started anything. We've been going less often lately, maybe 2 times a week. And we live in a very dog dense neighborhood, we maybe pass 15 dogs every day on our walks, which has never caused an issue.
She's started becoming slightly reactive on the leash in the last month. Initially just her haunches would go up, and then it became little growls or barks (this phase came off to me as her being a frustrated greeter), and now she fully loses her mind, lunging, growling and barking.
A bit after her haunches started going up, she got into a tiny tussle at the dog park (I thought it was the other dog starting drama, I intervened very quickly, no one got hurt), and then we had to leave the next two times we went (because things were escalating between her and another dog both times), and now I think she's the one being antagonistic to dogs who do not want to play with her, and so we don't go any more at all.
At the same time, she's gone from being incredibly easy to walk, very good leash skills, to incredibly difficult to walk. She started chewing things at home after being very good about only chewing her things. And she even jumped at an old lady we were just walking past once (not aggressive, just eager to say hello), and she's never jumped at a person while walking except once when she was still very young.
I immediately started training her reactivity as soon as it started escalating beyond her haunches going up. And initially it was working very well. I just gave her a reward every time she looked at me after looking at another dog. And she picked it up pretty much immediately. She would look at me without even a verbal reminder or her hearing my hand go into the treat bag. For the most part, her haunches weren't even going up.
But now, something else switched, and she won't look at me when she sees another dog. She won't respond to me grabbing treats or giving her a verbal command what-so-ever. She starts barking and lunging, and even if I get her attention before the dog gets close enough for her to notice, she'll still loose her mind if she notices the approaching dog.
I'm at a loss, I feel like I've done everything correctly. We live in a very dense neighborhood filled with tons of families and small children and dogs, so any level of reactivity (even playful barking) is honestly a huge issue because I do not want her to scare children. At the same time, avoiding other dogs is incredibly difficult, so I've just been walking her down the least dog-populated blocks back and forth while I try to figure out a solution.
Any ideas?
TL;DR: Well socialized dog became increasingly reactive in the last month. I immediately started reactivity training and even though it was going perfectly initially, something flipped and now the reactivity training doesn't work at all, and she's so bad I can barely walk her.