Will adding apple cider vinegar acv to a dogs drinking water kill ticks and fleas?

To answer your question, ACV has been used in repelling & killing ticks. I spray our yard with it to repel ticks, as they do not like the taste or smell. I also use about 1 teaspoon daily in my dogs water & even put some on a wet cloth and wipe him with it before he heads out in the yard. It has done wonders for keeping them at bay although you get that one or two but they are not attached so I would say Yes it works