• heartworm tablets for small dogs 6 tablets
  • heartworm tablets for small dogs 20 tablets

Product Disclaimer & Safety Information

Products sold by Pet Megamart are intended for animal use only unless explicitly stated otherwise. They are not intended for human consumption or human medical use.


Unless specifically labeled for food-producing animals, products are not intended for birds or animals whose meat or eggs will be consumed by humans. Customers are responsible for complying with all local, state, and federal regulations regarding animal use and food safety.


These products are not intended to diagnose, treat, cure, or prevent any disease unless expressly stated and legally permitted. Always consult a licensed veterinarian before administering any supplement or medication.


Keep out of reach of children. Store according to label instructions. Do not exceed recommended dosage guidelines.

Heartworm Tablets for Dogs - Heartworm Prevention for Dogs

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$18.95 USD
$18.95 USD
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Heartworm Tablets for Dogs

Heartworm prevention for dogs on this listing is a once-monthly ivermectin tablet, one by weight (up to 25 / 26–50 / 51–100 lb), to help prevent canine heartworm disease caused by Dirofilaria immitis.

Quick product facts

  • Brand: Vetafarm
  • Use stated: one correctly sized tablet each month
  • Does not treat established adult heartworms
  • Dogs six weeks of age and older when used according to the label

Monthly use

Heartworms are transmitted through the bite of an infected mosquito. Monthly prevention is described as eliminating susceptible immature larvae acquired during the preceding month before they develop into adult heartworms.

Give the tablet on the same date each month. Oral use, or crushed into food only when the product directions permit it. Do not substitute strengths or divide tablets unless the label or a veterinarian expressly allows it.

Directions as listed

Dog size Weight range listed Monthly dose
Small Up to 25 lb (11.3 kg) 1 Small tablet
Medium 26–50 lb (11.8–22.7 kg) 1 Medium tablet
Large 51–100 lb (23.1–45.4 kg) 1 Large tablet
Over 100 lb Over 100 lb (45.4 kg) Appropriate combination of weight-specific tablets, per label or veterinary directions

Confirm your dog’s current weight and follow the pack you receive. Do not give extra doses to make up a missed tablet without veterinary guidance.

Options and prices on this listing

Variant labels on this listing differ slightly from the chart above. Small and Medium include 6, 20, and 100 tablet options. Large is 6 or 20 tablets. Large 100-tablet is not a current option.

Listing option Price
Small (Up to 24 lb) / 6 Tablets $18.95
Small (Up to 24 lb) / 20 Tablets $44.95
Small (Up to 24 lb) / 100 Tablets $119.50
Medium (25-50 lb) / 6 Tablets $20.95
Medium (25-50 lb) / 20 Tablets $32.95
Medium (25-50 lb) / 100 Tablets $134.00
Large (51 - 99 lb) / 6 Tablets $16.79
Large (51 - 99 lb) / 20 Tablets $46.59

Match the option to the weight range on the pack you receive. The written chart uses up to 25 / 26–50 / 51–100 lb. The option labels use up to 24 / 25–50 / 51–99 lb. No milligram strength is stated.

Other points

  • For use in dogs only
  • Listed for pregnant or breeding females, stud dogs, and puppies six weeks or older as monthly ivermectin heartworm-prevention tablets. Confirm that on the label of the exact product supplied
  • No milligram strength is stated
  • Store below 30°C (86°F), unless the package states otherwise, in a cool dry place, container closed, original label kept
  • Tell your veterinarian about all medications and supplements the dog receives

Frequently Asked Questions

Which tablet size do I use?
Small up to 25 lb (11.3 kg), Medium 26–50 lb (11.8–22.7 kg), Large 51–100 lb (23.1–45.4 kg), one matching tablet each month. Dogs over 100 lb need a combination per the label or a veterinarian. Listing option labels use Up to 24 lb, 25-50 lb, and 51-99 lb — follow the pack you receive.
How often are they given?
One correctly sized tablet once each month. They may be given orally or crushed into food when the product directions permit it.
What packs are on this listing?
Small and Medium are described as 6, 20, or 100 tablets. Large is 6 or 20 tablets. Large 100-tablet is not a current option. Prices are on the table above.
Do these tablets treat adult heartworms?
No. Monthly prevention does not treat established adult heartworms. A dog with heartworm disease needs veterinary evaluation and a treatment plan.
What active drug and strength are listed?
The safety text refers to monthly ivermectin heartworm-prevention tablets. It does not state a milligram strength or a full active-ingredient panel. Confirm the pack you receive.
Can puppies take them?
Not for dogs under six weeks of age. They are for dogs six weeks or older when used according to the label. Ask a veterinarian before starting a puppy.
Important Safety Notice

For use in dogs only. Not for human use.

Test for existing heartworm infection before starting. These tablets are not an adult-heartworm treatment.

Do not use in puppies younger than six weeks. Choose the tablet that matches current weight. Do not divide or substitute strengths unless the label or a veterinarian specifically directs it.

Keep tablets out of reach of children and animals. Follow the label of the product received.

Heartworm Tablets for Dogs - Heartworm Prevention for Dogs

$18.95 USD

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Is veterinary guidance recommended before using this product?

While many avian and small animal products are available without an in-person veterinary visit, proper diagnosis is important. Birds and small animals can be highly sensitive to stress, and treatment decisions should always be made carefully. We recommend consulting a licensed veterinarian to confirm the appropriate product and dosage for your animal’s specific condition.

If a prescription product is required, we can help facilitate consultation with a licensed veterinarian where appropriate.

Is this product safe for my pet?

When used according to label directions, this product is intended for animal use. Always follow the instructions carefully and review the product description for species suitability and administration guidance. If you are unsure, consult a veterinarian.

Unless specifically labeled, products are not intended for human consumption or for animals intended for meat or egg production for human consumption.

How is this product administered?

Administration instructions are provided on the product label and in the product description. Depending on the formulation, this product may be given orally, mixed in drinking water, applied topically, or added to feed. Always follow dosage guidelines carefully and consult a veterinarian if you are unsure about proper administration.

How quickly will this product ship?

Orders placed before 12:00 PM MST typically ship the same business day (Monday–Saturday, excluding holidays). We offer real-time calculated shipping rates and expedited options at checkout. We ship within the United States only.

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