| Tri-Heart Plus is sold as a prescription drug in 6 or 12 pack supplies per pet per order. Most veterinarians require a heartworm test before prescribing a year's supply of heartworm preventative. Talk with your veterinarian for more information. Typically, veterinarians will authorize a maximum of 12 months of heartworm preventative per pet per year. This helps to insure proper dosing and prevents products from being used past their expiration date
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