[header] How to get a dog to stop drinking from the toilet [title] Catch your dog in the act. [step] The best way to train your dog to stop doing anything is to catch it in the act. Once you hear your dog slurping from the toilet or you see it drinking out of the toilet, it is your chance to act. 
[substeps] Because dogs have short attention spans, it is pointless to reprimand your dog after the fact. You will need to catch your dog in the act in order to correct the behavior.