As used in this chapter:

    At Large. Any dog shall be deemed to be "at large" when it is off the property of his owner and not under the control of a responsible person.

    "Department of Agriculture" means the Department of Agriculture of the state of Illinois.

    "Dog" includes a female as well as a male dog.

    "Inoculation" means the injection, subcutaneously or otherwise, as approved by the Department of Agriculture of the state of Illinois of canine antirabic vaccine, approved by the Department of Agriculture.

    "Owner" means a person having a right of property in a dog, or who keeps or harbors a dog, or who has a dog in his care or who acts as its custodian, or who knowingly permits a dog to remain on or about any premises occupied by him.

    Restraint. A dog is under "restraint" if he is controlled by a leash; at "heel" beside a responsible person, or obedient to that person's commands within a vehicle being driven or parked on the streets, or within the property limits of his owner or keeper. (Prior code § 9-1-1)