They're a more purposeful, laid back dog, in most cases, than Pitbulls tend to be. There are exceptions, examples of both lazier Pitbulls and the rare American Bulldog with an inordinate amount of energy, but even then, it's not nervous energy, and such exceptions in no way disprove the rule.
Anterior blepharitis is commonly caused by bacteria (staphyloccus blepharits) or dandruff of the scalp and eyebrows (seborrheic blepharitis). It may also occur due to a combination of factors, or less commonly may be the result of allergies or an infestation of lice on the eyelashes.
Abscesses are often polymicrobial, and E coli is one of the more common gram-negative bacilli observed together with anaerobes. Cholecystitis and cholangitis result from obstruction of the biliary system from biliary stone or sludge, leading to stagnation and bacterial growth from the papilla or portal circulation.