Upon the impoundment of any animal under the provisions of this Title, the animal control agency shall immediately notify the owner, if the owner is known, of the impounding of such animal, and of the terms upon which said animal can be redeemed. The impounding authority shall retain said animal for 48 hours following actual notice to the owner. The notifying of any person over the age of 18 who resides at the owner's domicile shall constitute actual notice to the owner. If the owner of said animal so impounded is unknown, then said animal control agency shall make a reasonable effort to locate and notify the owner of said animal.