Vicious is as vicious does, and this dog doesn't

EDITOR;
I am a 10-year-old Austintown boy who can't seem to understand the theory about what is considered by the Mahoning County Dog Pound to be a "potentially vicious" dog.
My dog, Calvin, got out of our yard and was picked up by a man and taken to the South Side of Youngstown. There, he got hit by a car, we later learned.
Many, many, many people helped us to find him three days later at the pound, where he was being treated as a vicious dog.
He is the nicest dog ever and loves everyone. How could a potentially vicious dog have its leg barely connected and still wag its tail and lick your face? I think pit bulls should be equal to all other dogs unless they're mean. This dog has tons of other breeds in him, mostly American bulldog. Who gives the dog pound the right to change what the vet said he was when the people at the pound couldn't even tell he had a badly broken leg? They said he just had some cuts on his tail.
I've been taught not to not like someone because of their background or race, but the law says its OK to judge a dog that way. What can I do to help change this dumb law?
DUSTIN WELSH
Austintown