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Had a Catahoula once. He was very stubborn. I can't imagine what a bulldog mixed with that would do for that trait.
Yes, it would be twice as stubborn, probably. In my experience American bulldogs can be stubborn. They usually have good judgment though.
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When your whole existence is caught up in hanging off the face of a bull, I guess it pays to have tenacity.
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Yes. The evolution is interesting. The bulldogs of England evolved into the fighting dogs (pitbulls). There is a theory that colonists brought bulldogs over with them to the US. They didn't look like the exaggerated "English Bulldog" of today. This is an old drawing:
They evolved into dogs like the american bulldog in the farms of the US south.
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