If any vicious dog shall, when unprovoked, kill or wound, or assist in the killing or wounding of, any sheep, lamb, cattle, dog, cat, horse, hog, swine, fowl, or other animal, or shall, when unprovoked, attack, assault, bite, or otherwise injure any human being or assist in attacking, assaulting, biting, or otherwise injuring any human being while out of or within the enclosure of the owner or keeper of such vicious dog, or while otherwise, on or off the property of the owner or keeper, whether or not such vicious dog was on a leash and securely muzzled or whether the vicious dog escaped without fault of the owner or keeper, the owner or keeper of such dog shall be strictly liable to the person aggrieved as aforesaid, for all damage sustained. It shall not be necessary, in order to sustain any nuisance action, to prove that the owner or keeper of such vicious dog knew that such vicious dog possessed the propensity to cause such damage or that the vicious dog had a vicious nature. Upon such attack or assault, the Animal Control Division or Police Department is hereby empowered to impound the vicious dog.