Rottweiler--not bad with children. They are a herding dog and a guard dog, and the owner should be aware of both habits. They are great dogs, like all dogs can be, as long as the owner is aware of exactly what the breed was bred to do, and works with these drives, not against them, to get the desired effect. For example, he should be wary of the fact that if his Rottie has any herding drive at all, s/he would be known to round the children up. May be wary of strangers. Either way, socialization is important with any breed, and your friend should go through a reputable breeder, or shelter, and at least talk to a responsible breeder to get a good idea of what to expect.There--that's out of the way.
The same is true for all breeds listed (and every breed in the world).German Shepherd--another herding dog, so he should be mindful of that. Smart, and yes, can be one-person, but that doesn't mean viciousness, necessarily. It just means, again, that socialazation is important to ensure that the GSD is open to strangers and to new situations.Huskies--he's right on that one. Huskies are extremely smart, and independent--as they were bred to be. They do not take too well to fences or cages, and are smart enough not to have to. Huskies, being as smart and un-willing (idependant) to please as they are, are a huge handful, and not for an inexperienced owner.That said, I hope your friend makes the right decision for everyone. Good luck to you all!
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