If the animals are not claimed and taken away by the owner, the poundkeeper shall, at the time and place set forth in the notice of sale, proceed to sell the animals one at a time, to the highest cash bidder. If the owner of any lot of animals to be sold is known, the poundkeeper shall sell only enough of the animals to pay the damages and costs, and the remainder may be turned over to the owner at any time thereafter; but if the owner is not known, the pound master shall proceed to sell all of the animals so advertised for sale. He shall execute and deliver a bill of sale therefor. (1986 Code)