Welcome to the forums!! This behavior is unacceptable!!! I'm not understanding this biting and nipping?? Is she doing this playfully? or from excitement ? or is she attacking people??
Shes excited. However for us living in the house she will bite too hard.
First thing is to forget this positive only crap. You need to be a balanced trainer. She needs consequences when she is behaving badly and praise when she is doing something right. First thing to do is get a crate. If she does not know how to settle....she has to learn. Put her in the crate when she is pacing back and forth...she needs to know she can relax. Rottweilers are a working breed...she needs a job to do. She needs far more exercise then a 15 minute walk. She needs to be able to full out run off leash. Can she retrieve a ball?? Teach her using two balls. What toys or chews does she have??
She has a crate. In the crate she will bark non stop which we ignore. We had to get the crate as she started eating things in the house. So now crate is used every night and obvious if everyone out. It's for her safety and ours.
So the 15 minutes is because after 15 she's lunging and biting. During training she will bite or mouth your hand. It's like a frustration.
Unfortunately has no interest in balls. Took her to a dog park. Just me and her. Took 10 different objects. Wouldn't go after any.
What kind of collar are you walking her on? Try a pinch or prong collar ....she will not be able to jump up and nip at people. Start training her every day twice per day for 5-10 minutes per day. She should know all of her basic commands..."sit", "down", "stay", "come", "drop it", "leave it", "stand", etc. and be able to do the commands consistently and everywhere. Get into a group training class.
She was on a harness clipped underneath. Now she's on a collar which is fabric. I have a 30 metre training lead. I 100% cannot let her off. If she sees someone she will get them within 2 seconds jumping at them.
She was taught all commands the minute she came home. She's will sit for food, etc but it's like her concentration is non existent. Obviously her job is me getting her to do things. Going for a walk; I'm order to walk her I will spend upto 20 minutes going through getting her out of the door, sit stay, the minute she moves we repeat. Sit stay treat, after 20 minutes she figures out the door isn't opening until she compiles.
For now start with Nothing In Life is Free ...do a google search. It's basically she works for everything. She wants to eat...she sits and waits till you give the command that she can eat, get her off of the furniture (keep a short leash on her in the house) and use it to get her off. Make her sit before she is leashed, make her sit before she goes out the door, etc.
Tried it all. I have books from library, I have literally tried every constantly to get her to obey. She will obey for food. Soon as food is removed or she's got something I'm her mind nothing changes it.
Make sure she understands that you are in charge...to me it looks like she has taken over and is running the show. Start being a leader and let her know that you are running things not her.