Heartworm prevention for dogs without vet prescription is a subject that raises both interest and concern among pet owners in the US. While some seek non-prescription options for convenience or affordability, most heartworm preventatives are regulated and require veterinary authorization due to the potential risks involved. These medications are designed to eliminate early-stage heartworm larvae and must be administered properly to be effective and safe. Without appropriate testing and dosage guidance, dogs may face serious health issues. Therefore, pet owners considering alternatives should be aware of the legal and medical implications of bypassing a professional veterinary consultation.