Each spring, I feed my dogs a tasty mixture on top of their meals based on foods that my vet recommends to keep parasites at bay. While it won't work for ticks (to the best of my knowledge--although doTerra does offer some great oils on that front), it does seem to keep my dogs' stomachs relatively calm:
1 quart yogurt (Dannon) or kefir
1/2 lemon squeezed
1/2 c. carrot juice or 2 grated carrots
1/4 c. sunflower or pumpkin seeds, roughly chopped (try a mortar and pestle)
1/2 c. C & H Brown or organic cane sugar
1/2 c. blueberries/blueberry juice
Now, I've had complaints that this is a lot. True! But with the number of dogs I have coming and going, it is the perfect quantity for my house. I simply scoop a tablespoon or two on top of their dog food and watch them enjoy. By the way, I eat it, too, but I do so sans dog food.
And, a confession, I don't measure, so all quantities are estimates!