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Although those police dogs are well capable of bringing down a large and fit man, they are also extemely stable and can be walked through crowds of people and petted by chldren and adults without any problem. Animals Dogs German Shepherd Dog Quiet Unisex 3D Graphic Hoodies. So, I understand the concern of those people who baulk at your mention of “be aggressive” but I think it is clear from your question that you do not mean that you want a dog that will run around biting all and sundry whenever it wishes. All of these breeds can provide the type of dog you desire but, as another respondent noted, selecting the individual dog is as important as selecting the actual breed. All the advice about seeking a good breeder who can point you to dogs that they’ve bred, is very sound. Whatever you do, don’t get one of these dogs from a shelter. Yes, I have done so and had some wonderful dogs that way but my role in recent years has been to work with dogs that have been abused and are overly timid, overly aggressive or very erratic in their behaviour. Rehabilitating these dogs is extremely demanding and I wouldn’t recommend it to anyone who has not had extensive experience with dogs and a good understanding of animal behaviour.