Looking for a simple, reliable way to stay on top of heartworm prevention? This HeartGard PLUS review breaks down what it covers (and what it doesn’t), who it suits best, and the key checks to make before you buy. It’s often shortlisted as a monthly heartworm chew for dogs because the routine is straightforward and many dogs accept the chew readily.
Important: Heartworm preventatives aren’t a “set and forget” purchase. Always read the label and consult your vet before starting, switching, or restarting any heartworm product—especially if your dog has been off prevention, has existing health concerns, or takes other medicines. Your vet may recommend a heartworm test before beginning a monthly chew, as product labelling typically requires dogs to be tested prior to starting.
What it is and what it treats/controls
HeartGard Plus is an oral, once-monthly chew for dogs. According to product labelling, it contains two active ingredients:
- Ivermectin – used for prevention of heartworm disease by killing susceptible heartworm larvae acquired in the previous month.
- Pyrantel – used to treat and control specific intestinal worms.
On label, HeartGard Plus is used to prevent heartworm disease and to treat and control these intestinal worms in dogs:
- Roundworms (ascarids) – typically Toxocara canis and Toxascaris leonina
- Hookworms (ancylostomes) – typically Ancylostoma caninum and Uncinaria stenocephala
It’s equally important to be clear on what it doesn’t cover. HeartGard Plus is not a flea or tick product, so it won’t address flea infestations or tick exposure on its own.
If you want to browse available options and sizes, you can view the range of HeartGard Plus products in one place.
Safety and responsible use
Using heartworm preventatives responsibly matters as much as choosing the right product. Keep these label-aligned safety points in mind:
- Testing before starting: product labelling typically states dogs should be tested for heartworm infection before beginning prevention. This is particularly important if you’re unsure about gaps in protection.
- Prescription status: depending on how your pet care is managed, heartworm preventatives may require veterinary oversight. Follow the purchasing and prescribing pathway recommended by your clinic and the product label.
- Minimum age/weight: use only in dogs that meet the label’s minimum age and weight requirements for the specific pack size. If you’re unsure, confirm with your vet before giving the first chew.
- Breed and medicine considerations: some dogs can be more sensitive to certain drug classes, and interactions may be relevant if your dog is on other treatments. Your vet is the best person to advise for your individual dog.
This article is general information and not a substitute for veterinary advice. Always follow the label directions for your exact product and your vet’s guidance.
Who it’s best for (and when to choose something else)
HeartGard Plus is usually a good fit for dogs that do well with chewables and for owners who prefer a predictable monthly routine. It can be especially appealing if you want heartworm prevention paired with treatment/control for roundworms and hookworms in a single step.
- Best match: dogs that reliably take chews, and households that are happy to manage flea and tick protection separately.
- Consider alternatives: if you specifically want a combined plan that includes flea/tick cover in the same product format, or if your dog struggles with oral treatments.
Also consider lifestyle and routine. If you tend to forget monthly tasks, you may prefer a plan that’s easier for you to administer consistently (whichever format your vet recommends).
Pros, cons, and real-world usability
Most shoppers reading a HeartGard Plus review want the practical details: is it easy to give, does it cover the key parasites you’re targeting, and does it simplify life?
- Monthly chew convenience: one recurring task can be simpler than managing multiple worming products on different schedules.
- Clear coverage on label: prevents heartworm disease and treats/controls roundworms and hookworms, which are common intestinal worms in dogs.
- Palatable format: many dogs treat it like a reward, which can reduce administration stress.
- Not a flea/tick solution: you’ll need a separate flea/tick strategy if those parasites are part of your risk profile.
- Weight-based sizing matters: selecting the correct pack for your dog’s current weight is essential for label-aligned use.
Quick tip: Pick a consistent “dose day” each month and set two reminders (one on the day, one the day after). That way, if life gets busy you still have a prompt to check whether it was given.
In terms of value, HeartGard Plus is often considered worth it when it replaces separate intestinal worming steps for roundworms and hookworms, while keeping heartworm prevention on a simple monthly schedule. Just remember to budget for any separate flea/tick product you may also need.
Chew vs topical vs combined products: chewables are popular for owners who prefer not to apply a topical treatment and for dogs that tolerate oral products well. Topicals may suit dogs that won’t take chews, while combined “all-in-one” options can be convenient if you want to cover multiple parasite types in one product. The right choice depends on your dog’s health history, parasite risks, and what you can administer consistently—your vet can help tailor a plan.
Dosing schedule basics (and missed-dose habits)
HeartGard Plus is designed to be given on a monthly basis. Many owners find it easiest to tie the chew to a regular monthly event (for example, the first weekend of the month) so the timing is consistent.
If you think you’ve missed a dose or your schedule has slipped, avoid guesswork. Check the product label for guidance and contact your vet for advice on the safest way to get back on track, especially if there’s been a longer gap or you’re unsure about your dog’s heartworm status.
For households managing multiple parasite products (for example, a separate flea/tick treatment), keeping a simple checklist can help you avoid accidentally missing one part of your plan.
How to choose the right size and buy with confidence
Buying the right option is mostly about matching the chew to your dog’s weight range and keeping your prevention schedule steady. Since HeartGard Plus comes in weight-based pack sizes, re-check your dog’s current weight before you reorder—especially for growing puppies and adolescent dogs.
When you’re shopping, focus on three things:
- Correct weight bracket: choose the size designed for your dog’s present weight (as shown on the product packaging).
- Format your dog will take: a chew only works if your dog actually eats it without stress.
- Plan for continuity: consider multi-month supplies so you’re less likely to run out and accidentally create a gap.
Simple size-selection example: if your dog weighs 11 kg today and the packaging shows a bracket that includes 11 kg, you’d choose that bracket—even if your dog was 9 kg last month. If your dog is still growing, re-weigh before each reorder so you can move up to the correct bracket when needed.
To compare available sizes and streamline your purchase, browse the full range of HeartGard Plus products and select the option that aligns with your dog’s current weight and your preferred supply length.
Frequently Asked Questions
Does it cover fleas and ticks as well?
No. HeartGard Plus is for heartworm prevention and treatment/control of specific intestinal worms (roundworms and hookworms). If you need flea or tick cover, you’ll typically add a separate product to your routine.
Which intestinal worms does HeartGard Plus treat and control?
On label, it treats and controls roundworms and hookworms in dogs. If you’re targeting other parasites as well, ask your vet whether you need an additional product.
Do I need a heartworm test before starting?
Product labelling typically states dogs should be tested for heartworm infection before starting a heartworm preventative. Your vet can advise on the right testing plan, particularly if your dog has had any gaps in coverage.
What if my dog refuses the chew?
Some dogs take it like a treat, while others need encouragement. If refusal continues, don’t force an unreliable routine—speak with your vet about alternative formats so your heartworm prevention plan stays consistent.
Is it safe for all dogs?
Most dogs use it without issues when it’s selected correctly for their weight and used according to the label. However, individual health conditions, sensitivities, and other medicines can change what’s appropriate. If you’re unsure, consult your vet before starting or switching.
Ready to simplify your monthly routine? Explore HeartGard Plus products to choose the right size and stock up for consistent protection.