The owner of any dog which shall bite a person while such person is on or in a public place, or lawfully on or in a private place, including the property of the owner of the dog, shall be liable for such damages as may be suffered by the person bitten, regardless of the former viciousness of such dog or the owner's knowledge of such viciousness.
For the purpose of this section, a person is lawfully upon the private property of such owner when he is on the property in the performance of any duty imposed upon him by the laws of this state or the laws or postal regulations of the United States, or when he is on such property upon the invitation, express or implied, of the owner thereof.