The pictures I have seen, if the dog you are refering to is in your avitar, all look like pit and/or amstaf to me.
Many characteristics that are refered to specific breeds are quite common with most breeds. All of my dogs stalk and freeze, usually a hunting dog or border collie thing. Most of my pits/amstafs, 5 out of 6, have feet that are very well webbed, a retriever thing.
I have seen many dogs, especially pit types miss identified, both because of their characteristics just being uncommon for the breed and because people discriminate.
Luke, the dog in my avitar is a registered amstaf, his parents are champions, but when people see him compete in agility they ask if he is a border collie cross because he is so fast and because of his color. I have also had people think he was a Swiss Mountain Dog or even a Boxer. He is a little taller than standard.
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"Pedigree indicates what the animal should be;
Conformation indicates what the animal appears to be;
But, Performance indicates what the animal actually is."
- author unknown