It depends on the dog, really. But I have to second that pugs are great with children. They tend to be happy and playful and small enough not to be as much of a hazard as a jumping Lab or Golden, if you go for a puppy.
Boston terriers, too, are a great all around dog. Vicious? Any poorly bred or dominant personality dog that is bred for aggression and then poorly trained or socialized.(Strong emphasis on the poorly trained and socialized!) If you are not dog experienced, and unsure if you can handle a strong temperment, go with a "soft" breed.
Dogs with dominant temperments are not for everyone.
I don't know of any dog that has a different viscosity than another. Because of the lack of spelling, you are asking which dog has the greastest resistance to flowing...As far as what you were trying to ask...Vicious dogs are generally mismanaged, and so from birth none can be considered more violent than the other. It's nurture, not nature.
I'd go with an Australian Shepherd or a Lab.
In my opinion there is no "Most vicious type of dog". All breed are created equal. I would avoid any place that associates with puppy mills, though.
Those dogs are badly treated, as well and bred/inbred to death. They aren't cleaned or taken care of, and are more likely to snap, regardless of the type. Pit bulls are, in fact, fabulous family dogs.
I have reared all types of dogs from puppies. So, if you start with puppy then you will have no problems for your children. Only thing that you need to be aware will be when the dog has reached their dying age between 15 - 25 years (varies from different types of dogs), dogs tend to be erratic.
I have heard nothing but good things about Labs. We have a Chocolate Lab that is over a year old and we have 2 boys. She has yet to snap, growl or show any kind of viscous actions against anyone.
We did have a Springer Spanial prior to her and had to put him to sleep, only 2 years old. He wanted to "snap" at the kids and visitors and the Vet recommended that we put him down because it would only get worse.
Most vicious breed... hard to say which particular one tops the list. But for kids it's understandably a no-no to Rottweilers, Boxers, Pitt Bulls, and Alsatians. Border Collies and Goldens are one of the best for children at any ages due to their gentleness,tolerance, and loyalty.
But if your kids have sensitive noses, then it might be better to consider Poodles as they have hair instead of fur and therefore don't shed much; plus they come in various sizes to cater to your circumstances.
It's a very popular opinion that Pit Bulls are the ones to "just snap" more frequently than any other kind of dog. As far as the one that is the best for kids, there are many out there that are very good with kids. Austrailian Sheppard's and Schipperke's are really good.
Like Daffy Duck said, Pit Bulls are known to be vicious and not good with children. Labradors and Golden Retrievers are always a family favorite, in addition to Beagles and Pugs.
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