For you preferred collie border dog skeptical training she ready normal Doberman recommends Prozac more training for her. She completed 2 dog training classes before the was not aggressive with other people dogs then, but was fearful of them. It is difficult to not get angry at her, yelling shut up, stop it, no, no, no, as she pulls me off feet when I try to walk her, even just around our house, least of all past other houses. First, it's too hard to tell from your post what the aggression stems from. It's also not clear that this is aggression vs just the excitement of a high drive dog. Dobermans need training and mental stimulation every day. I have several suggestions for exercise. first question would be, how old is she now. Not knowing her age, I would say talk to your vet, but there are a several things that work. The first I would recommend is a dog scooter such as the one sold on k9kennels. This scooter would keep her under control while giving her a job while out and about experiencing the real world. Another great thing to try is a flirt pole. You can purchase them on line, or you can make one by buying a horse lunge whip and putting a pull toy on the end. There are tons of YouTube videos on flirt poles). You can also train her to fetch. A lot of Dobermans are vocal. Dogs have a hard time understanding what you mean when you tell them not to bark. The best way to teach them not to bark is to teach them to bark on command first. There are YouTube videos out there about that as well. Most importantly you need a contact a great trainer. There aren't a lot of trainers that have experience with dobes. They train different than herding dogs such as Shepards. Also, if they have nosework classes your area they are great for dogs with aggression issues. But, most importantly if there is a Doberman rescue association your area you should contact them now. They not only know the breed, but want to help people have a better relationship with their dog. Last, but not least, and I have no idea if this is your problem, but it is something to consider. Dobermans were the only breed created for personal protection. They are extremely tuned to their owners. You need to take a look at yourself. If you're anxious about your dog situations, your dog tune to that and become anxious and ready to defend. The dog doesn't know that you're anxious about them, they interpret it to the person dog situation they are at the moment. Your dog is feeding off you. You need to treat her as a dog first and for most. Distraction works well. Do not let the dog on any furniture your home. Make a few spots close by you on the floor for her to sit or lie down. When her behaviour is bad DO NOT YELL OR HIT. Take her to a dog bed and make her sit or down. If she gets off the bed return her; a of three times. The fourth time if she comes off the dog bed put her a dog cart. When she totally relaxes open the door and do not say a word just go about your day. When walking on the street when a person or a person with a dog walk your way sit your dog a few feet off to the side. Do this softly a nice easy Sit Stay. If she gets up and pulls jumps whatever redo the Sit Stay. To get your Dob to focus on you well walking the dog. Find a bench and have her jump up on the bench and sit. Then have her walk along the bench to the end. Do not let her jump off you give her the command to jump off. Do this exercise a few times and every time you go for a walk. Your Doberman needs your direction needs to focus on you. Take 10 minutes at the start of your walk and at the end of your walk and work the dog with sit stay stand down and heal. When walking on leash the dogs head should be at your knee. Only reward good behaviour. Best of luck Shock collar? RIDICULOUS!! 😤 People like you shouldn't be allowed to own animals of any sort! Proper training with treat rewards for good behaviour. Being ignored for bad behaviour for brief periods. PLENTY of exercise. Teach the dog to retrieve their walk is ten times further than your walk. Keep their minds active. Plenty of chew toys. Toys which contain treats that they need to work out how to get. DONT USE A SHOCK COLLAR! Doberman is almost 2 years old. I brought him home at 8 weeks. At first he was scared to get off the driveway to go for walks. Then as he grew older he started acting aggressive towards other dogs as we passed them and lunged at bicycles. I read on Internet to put cookies your pocket and every time you pass a person, dog or bicycle give him a cookie. He has found that passing other dogs, people and bicycle are good things