Hey all, my 8 1/2 month old Corgi named Courtney has recently developed an aggression towards dogs, particularly at the dog park. I got Courtney when she was 8 weeks old and brought her into a house with sometimes 3 dogs of different sizes and she does great with them. I would also bring her out places (not the dog park when she was little) and see other dogs and do fine. Now recently, I have started taking her to the dog park and when she gets around the other dogs she almost turns rabid! Teeth bared, growling (even foamed at the mouth a couple times), and snapping at the other dogs so I have to hold her back. I know she's incredibly protective of me and not spayed, but I'm just honestly not sure what has caused this sudden change in behavior from her. I have tried taking her there more often to kinda get her used to the other dogs but she does it every time and when I took her out yesterday almost mauled a 5 month old retriever puppy. She is the sweetest dog you will ever meet around people and is generally so happy go lucky at home (despite her nipping problem). Any suggestions or ideas? Thanks so much!