Heartworm prevention for dogs without vet prescription is a topic of growing interest among pet owners in the United States. Heartworm disease is a serious and potentially fatal condition transmitted through mosquito bites, and preventive medications are usually prescribed by veterinarians. These medications require a prescription because a heartworm test is essential before starting treatment. Seeking heartworm prevention for dogs without vet prescription can pose health and legal risks, as improper use may lead to adverse effects or ineffective protection. Veterinary supervision ensures correct dosage, safety, and overall effectiveness in preventing heartworm infection and maintaining a dog’s long-term health.