The safest way might be to try to gently pull the dogs away from each other. If not then maybe a bit harder. If they do not have their leashes on then try to distract them with something else. Maybe pull on their collar too.
Answer:
Chose a diet that is high in red meats
Explanation:
Tell them straight forward tell them how its bad for you a thousands of people die from drinking and drugs tell them that you want the best for them and the best thing is to not do drugs or drink