HeartGard Plus for Dogs
No Prescription Required

Heartgard Plus contains ivermectin and pyrantel, two active ingredients that work against different parasite classes. Ivermectin prevents heartworm disease by eliminating Dirofilaria immitis larvae before they mature, while pyrantel targets roundworms (Toxocara canis, Toxascaris leonina) and hookworms (Ancylostoma caninum, Uncinaria stenocephala) through neuromuscular paralysis. The chewables are labeled for monthly use in dogs aged 6 weeks and older.

Anipetshop operates under an Australian APVMA pharmacy license, which classifies Heartgard Plus as an over-the-counter veterinary medication. The U.S. FDA requires a prescription for the same product; the active ingredient formulations and dosage standards are identical across both markets.

Can You Buy Heartgard Plus Without a Vet Prescription?

Yes. Heartgard Plus can be obtained without a veterinary prescription through Anipetshop, a licensed online pharmacy operating under Australian APVMA regulations.

Prescription status is determined by the regulatory authority governing the point of supply rather than the product itself. The formulation of Heartgard Plus, including its active ingredients, strength, and dosage regimen, remains consistent across markets.

In the United States, the FDA designates Heartgard Plus as a prescription-only veterinary medicinal product, requiring a valid veterinarian client patient relationship (VCPR) prior to dispensing. This restriction applies to U.S.-licensed pharmacies and veterinary providers.

By contrast, the Australian Pesticides and Veterinary Medicines Authority (APVMA) classifies Heartgard Plus as an over-the-counter parasiticide. Under this framework, Anipetshop is permitted to supply the product without a prescription, including to international customers. The medication provided is manufactured to the same specifications, containing identical active ingredients as the U.S. prescription equivalent, ensuring comparable efficacy and safety.

Explore the Soft Chew Formulation

Heartgard Plus is a monthly soft chew containing ivermectin and pyrantel pamoate, formulated to prevent heartworm disease and treat and control roundworms and hookworms over a 30-day cycle. Each chew is made with real beef, which supports voluntary acceptance by most dogs without requiring the medication to be hidden in food.

The following describes the physical and storage properties of the chew formulation:

• Flavoring: Real beef content. Most dogs accept the chew voluntarily, which reduces the risk of incomplete dosing from refusal or spitting out.
• Active ingredients: Ivermectin and pyrantel pamoate. Inactive excipients include beef chunks, corn starch, glucose, magnesium stearate, and wheat bran.
• Physical form: Brown, soft and chewy, square or rectangular in shape.
• Storage: Store at or below 25°C (77°F). Brief temperature excursions up to 40°C (104°F) are permitted. Keep out of reach of children.

Three weight-based strengths are available. The table below shows the corresponding pack options and pricing:

Take the Correct Dosage

Heartgard Plus dosage is based strictly on body weight, with a minimum effective ivermectin dose of 6 mcg of ivermectin per kilogram (2.72 mcg/lb) and 5 mg of pyrantel (as pamoate salt) per kg (2.27 mg/lb) of body weight, administered once monthly as a complete chewable. Weight alone determines which strength to use; age, breed, and size classification are not dosing criteria.

The table below shows the three weight-based strengths and their active ingredient quantities:

For dogs over 100 lbs (45.4 kg), a combination of strengths should be used to reach the correct total dose. Consult a veterinarian to confirm the appropriate tablet combination for your dog’s exact weight.

When a dog’s weight falls near the upper limit of a range, select the next higher strength. A 51-lb dog, for example, sits 1 lb above the Green (26 to 50 lb) range. The correct choice is the Brown (51 to 100 lb) chew: the higher dose is within the labeled safety margin for that weight, while the lower dose delivers insufficient ivermectin to eliminate all L3 and L4 heartworm larvae, risking development into adult Dirofilaria immitis. Underdosing at a weight boundary is the most common cause of preventable heartworm breakthrough on a monthly protocol.

Why Dog Owners Should Choose Heartgard Plus

Heartgard Plus is widely selected by dog owners due to its established safety profile, reliable broad-spectrum endoparasite control, and high palatability that supports consistent compliance. The ivermectin and pyrantel pamoate formulation covers heartworm, roundworm, and hookworm in a single monthly dose, without adding flea or tick actives that require separate clinical justification.

The following outcomes reflect why veterinarians have consistently recommended Heartgard Plus as a first-line heartworm preventive:

• Voluntary acceptance in most dogs: The soft beef chew formulation is accepted without hiding in food by most dogs, which reduces the risk of partial dosing or missed doses due to refusal.
• Usable from 6 weeks of age with no minimum weight restriction: Protection can begin at the earliest point in a puppy’s life, covering toy breeds and small puppies who fall outside the labeled weight range of many other parasiticides.
• Over 35 years of post-market safety data: More than 2 billion doses administered provides one of the largest real-world safety datasets of any veterinary parasiticide, giving a clearer picture of adverse event frequency and breed-specific risk than newer isoxazoline-class products.
• Heartworm, roundworm, and hookworm coverage without flea or tick actives: Dogs that do not require flea or tick treatment can receive targeted internal parasite protection without unnecessary exposure to additional drug classes.

How Do Pet Owners Review Non-Prescription Heartgard Plus Online?

User-reported outcomes from long-term Heartgard Plus use consistently reflect the product’s clinical profile. On Influenster, one reviewer reported administering Heartgard Plus to multiple dogs over several years, including selective eaters, with no refusals and no heartworm or intestinal parasite infections detected throughout consistent monthly use.

A YouTube reviewer reported a similar outcome across multiple dogs over several years of monthly use, with no heartworm cases recorded. The chewable format was accepted without requiring the medication to be concealed in food.

Order Heartgard Plus for Dogs Without a Vet Prescription at AnipetShop

Heartgard Plus is available through Anipetshop without a veterinary prescription, supplied under Australian APVMA licensing. The following describes the sourcing and product standards that apply to every order:

• Product authenticity: All stock is manufacturer-original, with English labeling that matches the labeled dosing instructions. No generics or substitutes are carried.
• Sourcing: Products are sourced from licensed manufacturers across Australia, and Europe, depending on the brand’s country of origin.
• Shelf life: Stock is managed to maintain potency within the labeled shelf life at the time of dispatch, so the product reaches the dog at full labeled efficacy.
• Regulatory basis: Anipetshop operates under Australian APVMA regulations, which classify Heartgard Plus as a non-prescription parasiticide. Active ingredients and dosage standards are identical to the prescription version sold in the U.S.

How Heartgard Plus Works on Dogs

Heartgard Plus protects against heartworm disease and certain intestinal parasites through two complementary active ingredients that act at different stages and locations within the body.

Ivermectin targets immature heartworm larvae, specifically the L3 and L4 stages transmitted by infected mosquitoes. It disrupts nerve signaling by binding to glutamate-gated chloride channels, leading to paralysis and elimination before the larvae can develop into adult Dirofilaria immitis. Since ivermectin is cleared from the body within a few days, each monthly dose is designed to eliminate larvae acquired over the previous 30 days, making consistent administration essential.

Pyrantel pamoate works locally in the intestinal tract. It acts as a neuromuscular blocking agent, inducing paralysis in roundworms such as Toxocara canis and Toxascaris leonina, as well as hookworms like Ancylostoma caninum and Uncinaria stenocephala. The immobilized parasites are then expelled or broken down within the digestive system.

Together, these ingredients deliver dual-layer protection, targeting heartworm larvae in body tissues and eliminating intestinal worms within the gastrointestinal tract.

How Should You Administer Heartgard Plus?

Heartgard Plus should be given once monthly by mouth as a complete chew, offered by hand or alongside a small amount of food. A veterinarian should confirm the dog is heartworm-negative via antigen test before the first dose is administered, as giving a preventive to a dog with an existing adult heartworm infection can cause adverse reactions.

The following steps cover correct administration:

1. Select the correct strength: Choose the tablet that corresponds to your dog’s current body weight, not age or breed size. For example, a dog weighing 15 lbs requires a different dosage than a dog weighing 50 lbs.
2. Offer with food: Give the chew during or immediately after a meal to support acceptance and reduce the likelihood of vomiting.
3. If the dog does not take it voluntarily: Place the chew at the back of the mouth or conceal it in a small amount of food.
4. Confirm the full dose is consumed: If vomiting occurs within one hour of dosing, administer a replacement dose.
5. Maintain the monthly interval: Administer on the same date each month. Extending the interval beyond 30 days leaves a window during which larvae acquired in that period will not be eliminated.

Are There Any Side Effects of Heartgard Plus to Consider?

Adverse reactions to Heartgard Plus are uncommon at labeled doses but have been reported. The following reactions have been documented post-administration:

• Gastrointestinal effects: Vomiting, diarrhea, and loss of appetite are the most frequently reported reactions and are generally transient.
• Neurological effects: Seizures, ataxia, and muscle tremors have been reported. These are more likely in dogs with the MDR1 (ABCB1) gene mutation, which impairs the blood-brain barrier’s ability to exclude ivermectin.
• Other reactions: Lethargy, hypersalivation, and pruritus have also been reported.

Consult a veterinarian promptly if any of these signs appear after dosing. Dogs with a history of seizures or neurological conditions, and herding breeds including Collies, Australian Shepherds, and Shetland Sheepdogs, should be tested for the MDR1 mutation before receiving any ivermectin-based product.

Are There Heartgard Plus Alternatives That Don’t Require a Vet’s Prescription?

Several alternatives to Heartgard Plus are available through Anipetshop without a prescription, covering different parasite profiles and delivery formats. The appropriate choice depends on which parasites require coverage and whether the dog has any contraindications to specific drug classes. Consult a veterinarian if the dog’s parasite risk profile or health history is unclear.

The following alternatives are available:

• Valuheart: Contains ivermectin at the same labeled dose as Heartgard Plus for heartworm prevention. Delivered as a small meat-flavored tablet rather than a beef chew, which may suit dogs who refuse the Heartgard Plus format.
• NexGard Spectra: A monthly isoxazoline-class chew (afoxolaner plus milbemycin oxime) covering heartworm, fleas, ticks, mites, and intestinal worms. Dogs with a history of seizures should not receive isoxazoline-class products without prior veterinary clearance.
• Simparica Trio: A monthly chew combining sarolaner, moxidectin, and pyrantel, covering heartworm, fleas, ticks, and intestinal worms. The same isoxazoline seizure contraindication applies.
• Credelio Plus: Contains lotilaner and milbemycin oxime, covering heartworm, fleas, ticks, and intestinal worms. Isoxazoline seizure contraindication applies.
• Advocate : A topical spot-on containing imidacloprid and moxidectin, covering heartworm, fleas, and intestinal worms including lungworm. Does not cover ticks.
• Interceptor Spectrum: A monthly chew containing milbemycin oxime and praziquantel, covering heartworm, roundworm, hookworm, whipworm, and tapeworm. Does not cover fleas or ticks.
• Nuheart: A generic ivermectin tablet with the same active ingredient and dose as Heartgard Plus, without the beef chew formulation.

FAQs

Can Heartgard Plus Chews Be Given to Pregnant Dogs?

Yes. Heartgard Plus has been evaluated at recommended doses in pregnant females, breeding females, stud dogs, and puppies from 6 weeks of age with no minimum weight restriction, and no adverse reproductive or developmental effects were identified in these groups.

How Often Should I Give My Dog Heartgard Plus?

Administer one chew once monthly, on the same date each month, throughout the year.

How Long Does a Dose of Heartgard Plus Last?

Each dose eliminates heartworm larvae, hookworms, and roundworms acquired during the preceding 30 days. Ivermectin is cleared from the body within a few days of dosing, so the monthly interval is the minimum schedule required to prevent larvae from the previous cycle surviving to the next dose. Extending the interval beyond 30 days creates a window in which larvae acquired late in that cycle remain untreated.

Do Heartgard Plus Chews Need to Be Used Year-Round?

Yes. The American Heartworm Society recommends continuous year-round use regardless of season. Mosquito activity does not cease entirely in colder months, and a single missed or delayed dose is sufficient to allow larvae deposited during that window to survive.

Does Heartgard Plus Only Prevent Heartworm?

No. Pyrantel pamoate, the second active ingredient, treats and controls hookworms (Ancylostoma caninum, Uncinaria stenocephala) and roundworms (Toxocara canis, Toxascaris leonina) in the gastrointestinal tract.

What Happens If I Miss a Dose of Heartgard Plus?

Administer the missed dose as soon as it is noticed. Do not administer two doses within a short interval to compensate. Resume the regular monthly schedule from the date the missed dose was given, and note that larvae acquired during the extended gap will not have been covered.

How Does Heartgard Plus Compare to Other Heartworm Preventives Available at Anipetshop?

Heartgard Plus covers heartworm, hookworm, and roundworm only. Alternatives such as NexGard Spectra, Simparica Trio, and Interceptor Spectrum extend coverage to fleas, ticks, or additional intestinal worms depending on the product. Consult a veterinarian to determine which parasite profile is appropriate for your dog.