Hello, my family and I got an english bulldog puppy about two weeks ago. The first two weeks have been a success however as of yesterday, she is displaying poor behavior, not wanting to walk on her leash, being a little aggresive/nippy, barking. We have been rewarding her good behavior and telling her "No!" when she does something that we so not like. I literally had a mini breakdown and started crying because I have been sacrificing my time/sleep to care for her and I feel like I'm being rejected. I know that they can be stubborn, so I'm not sure if this is part of the growing curve but I could use some help. I don't want to go crazy trying to correct it to no avail. Please help!