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If a person has an animal that is considered a pet, then that animal should never be a vicious one, especially a large dog. Not only can it be dangerous for the family that owns the pet (especially when they have children); but if the dog bites another person, the people wold probably sue the pet owners, and they would have to pay expensive medical costs.
Also, there is a law, at least here in the United States, that if a dog or cat bites a person, the person has to be tested for possible rabies, and the animal is usually put down as a dangerous dog, or because they might have rabies.
Sometimes, farms or even businesses will have a guard dog, and then that dog is not supposed to be a pet, and when the business is closed and the dog is on duty, it is part of his job to stop an intruder, even if he has to bite the person to do that.
If a dog is protecting his owner, and bites someone, then the dog is only doing what he is supposed to do; so normally that would be fine and acceptable behavior, even if the dog was a pet.
As for the pet pigeon that pecked people, I think that I would have moved it outside and kept it out there ! !
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