Looking for advice with a 1 year old who is becoming dominant and aggressive.
We got Lucy when she was about 8 weeks old. She was well socialized and has always done well when we take her to the dog park. She has never shown any signs of aggression around people, and when she is leashed she never acts aggressively towards other dogs. Over all she is a very well behaved dog, we have gone through Intermediate training and are continuing on to Advanced.
Lucy turned 1 year in July of this year and that is when we started having problems with her acting aggressive towards other dogs when we take her to the park. At first it was with small dogs who instigated by barking or biting at her and then she would retaliate but over the last two months now it is at the point where there are a few things that seem to set her off. I can't trust her almost at all around little dogs because if they act aggressive towards her at all it leads to a fight, and if a game of "chase" starts up she gets all worked up and that ends in a fight. And it's no longer only limited to small dogs now it's any dog that is smaller than she is or just more submissive. It seems like she does ok until she gets overly excited, and then when play becomes too rough she lashes out. It's particularly bad when we first get to the park so I've been taking her for a walk alone when we first arrive to get out that initial burst of energy and that usually helps. At first when she got into a fight I would get her away and put her in a down stay. Lately if it happens I've just been leaving the park with her.
Unfortunately, we currently live in an apartment. This is not ideal however it is temporary. But we literally take her to the park every day, along with lots of other exercise throughout the day besides the park. Her increasingly dominant behavior and aggression towards other dogs when off leash is scary and embarrassing. I have spoken with Lucy's training instructor about the issue and her advice is to keep doing what I'm doing but I feel like it's not enough. I would really appreciate some advice on this issue and how to proceed from here.