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From his perspective, the court’s opinion is more about public health, Mr.. Dunne said, as it deals with dogs that bite, attack and have killed people.

“I don’t have any issue with people having the right to choose what dog they own,” Mr.. Dunne said.

Judge Dale R. Cathell, who wrote the opinion, acknowledged in the document that “breed specific legislation” can be problematic, but the opinion “does not ban pit bulls but puts a greater responsibility for vicious dogs … with the owners and others who have the power of control over such dogs.”

Carolyn Kilborn, the chairwoman and founder of Maryland Votes for Animals, said the court’s opinion “is similar to racial profiling.”

“No one wants anyone to be bitten by a dog,” said Ms. Kilborn, who attended the rally along with other members of the political action committee. “That can be a serious and a traumatic thing. I think that perhaps the judges had good intentions, but the ruling is misguided. It actually creates more problems than it solves.”