I’ve been a vet. tech for almost a year now and cannot tell you how many cases of hartz poisioning I’ve seen. As a pet owner myself, I understand how expensive products like frontline and advantage are. Both products are worth it for the health of your pet. Did you know that the active ingredient in frontline was first used in Europe to cure head lice in infant children? A dog can ingest over a hundred tubes of frontline and be ok (Dont try it though). I own a small cat and a 5 pound chihuahua and the best cheat I have found is to use frontline spray on both. Its more cost efficent over time and lasts one month, just as long as frontline plus top spot. Spend the money for products that your vet recommends. After all, they did go to school to give your pet the best health care.