A drinking trough for dispensing of medication to an animal to be treated. The drinking trough comprises a drinking bowl and a supply of water coupled to the drinking bowl via a water supply conduit. A valve is located along the water supply conduit for controlling dispensing of water into the drinking bowl, and operation of the valve is controlled by a lever. A plurality of medication administering containers are coupled to the water supply conduit for each administering of a desired medication to the supplied water. Each one of the medication administering containers has an associated control valve coupled to the computer to operate the associated control valve and facilitate automatic dispensing of the medication from a desired one of the medication administering containers into the water supply conduit.