I guess it's hard explain what happens when we walk.....it goes like this.....walking fine, see another dog, sometimes ignores it and we're fine...Other times she starts this yelpy, whiney, squealy, excited type barking, so I usually do let her go up to the dog on loose lead, she seems to be wagging her tail and happy, the dogs could be nose to nose then outta no where Jersey lunges on the back of the dog biting and growling. This happened a few times until I decided to not let her close to another dog when she gets excited like that. She might be trying to play, but other dogs don't see it like that and get aggressive too. The previous owners couldn't get a handle on it either and resorted to putting a muzzle on her, I have not used it yet though.
Today, we walked around the trails by the beach, lots of people and their dogs were there. So I thought I'd let her go on the retractable leash and see if she was calmer, but the same thing happened when i didn't restrain her she went after a shitzu and lunged on it! After that I kept her close, when other dogs approached I just got her attention and distarcted her if she started squealing, so it was better that way.
She has been fine with other dogs though, so I have no idea why she acts like this occasions? I may need to find some other ways of calming her down?