If your dog is just as sensitive and allergic to the medications and treatments for preventing flea and ticks, as my dog Meagan, you may want to try an all natural remedy. This is what we put on our dogs every time we head out on a hike in the woods, and it works like a charm: Mix 1 part lemon concentrate with 1 part water into spray bottle, mix well. Avoid spraying the eyes, by rubbing mixture on the face. Apply every time you head out to the woods. Always check for ticks after the hike. This is something we do after every hike as an extra precaution, and so far our dogs have been tick free!