1. Feed high quality meat based diet without any fillers such as grains, lentils. This builds immunity, higher the immunity lesser is the chance for a tick to latch on pet 2. Add garlic in meal everyday. A small amount is not at all toxic it will repel ticks 3. Add a little apple cider vinegar to the meal, this keeps the pH controlled and keeps the ticks at bay

I would suggest you to go through the guide once, everything is mentioned there related to your query.