fowl at large

CHO Municode Sec. 4-8. Fowl at large.
It shall be unlawful for any person to permit any chickens, ducks, geese, pigeons or other fowl belonging to him to go at large in the city; except, that homing pigeons may be released for return to their cote without violating this section.

Article in the WaPo today about a pitbull, that same story. Unprovoked dog puts teeth to human.
Should legislation be considered? You can't legislate against a type of dog?
I wonder who the chickens offended?