Here's the breakdown:
* Old English Bulldog: The foundation breed for the American Bulldog. These dogs were brought to America by early settlers and were used for bull-baiting and other work.
* Other Mastiff-type Breeds: While not officially recorded, some believe other Mastiff breeds, such as the Bullmastiff, may have been used to develop the American Bulldog.
* Other Terriers: The American Bulldog is known for its tenacity and athleticism, which likely came from terrier breeds like the Old English White Terrier.
It's important to note that the American Bulldog is a distinct breed with its own unique characteristics and lineage. While its origins are intertwined with other breeds, it's not a mix.