Hello! I have been taking katniss for walks around the apartment building for a few month now (on a harness and leash), but lately she has been getting really aggressive during her walks. If I try to redirector her, she will growl and sometimes hiss, and when its time to go in she won't let me touch her to pick her up, and sometimes will even lay down and i almost have to drag her!! at first, i thought it was the people around trying to pet her, theres a little boy that always wants to pet her but he doesn't pet,he gropes, so we go out later when everyone is sleeping. any suggestions on what could be causing this or even ways to stop the aggression?