Heartworm medication does not prevent roundworms or hookworms. These are different parasites with different life cycles. You'll need to use a separate deworming medication to address these parasites.
Here's what you should do:
1. Talk to your veterinarian. They can recommend the best deworming schedule and medication for your dog, based on their age, breed, and lifestyle.
2. Follow your vet's instructions closely. Deworming medication should be administered as directed to ensure effectiveness.
It's important to protect your dog from all types of parasites.