She's snapped at my mom and dad before and actually BIT the PetCo woman who was trying to put a harness on her to see if it fit. She's also dog aggressive in a way, she'll sniff them for a few seconds then start snapping and growling and lunging. We are 99% sure she was abused and manhandled in her past, so that's most likely the issue here.
What kind of classes/trainer would be able to help her (hopefully) with these issues? I'm already starting obedience classes with her but I'm not sure what other types are out there.
Thank you in advance, and please no negative feedback.