ProHeart 12 Cost vs Monthly Chews: Injection Price Comparison
Essential Pricing Takeaways
- • ProHeart 12 (moxidectin extended-release injectable suspension) provides 365 full days of continuous heartworm prevention in a single veterinary technician injection.
- • An annual ProHeart 12 injection costs between $75 and $130 depending on your dog's weight, making it highly competitive with 12 monthly doses of Heartgard Plus ($72–$95) and far cheaper than Simparica Trio ($260–$320).
- • While ProHeart 12 guarantees 100% medication compliance with zero missed monthly chewable doses, it only targets heartworms and hookworms; dogs still require separate monthly flea and tick protection.
Missed monthly doses are the leading cause of heartworm preventative failure in companion dogs across North America. Pet parents with busy schedules or dogs that routinely spit out meat-flavored chewables frequently ask whether an annual veterinary injection is more cost-effective than buying monthly oral chews.
ProHeart 12 by Zoetis utilizes microsphere lipid technology to release micro-doses of moxidectin continuously over 12 full months. In this 2026 cost and clinical audit, we compare the real annual expense of ProHeart 12 injections against monthly oral chews like Simparica Trio, Interceptor Plus, and Heartgard.
2026 ProHeart 12 Injection vs. Monthly Oral Chews Annual Cost Audit
| Preventative Option | Administration Schedule | Parasites Covered | Annual Veterinary Cost | Annual Online Pharmacy Cost | Best Value Verdict | Action |
|---|---|---|---|---|---|---|
| ProHeart 12 Injection (Zoetis) | Moxidectin Microspheres | Subcutaneous Veterinary Injection | N/A (Vet Admin Only) | N/A (Vet Admin Only) | 100% compliance guarantee; zero risk of missed monthly chewable doses | Check Price → |
| Heartgard Plus Chewables | Ivermectin + Pyrantel | Real-Beef Chewable Tablet | $74.99 (12-pack) | $72.50 (12-pack) | Time-tested ivermectin protection; requires strict monthly administration | Check Price → |
| Simparica Trio (All-in-One) | Sarolaner + Moxidectin + Pyrantel | Liver-Flavored Chewable Tablet | $274.99 (12-pack) | $268.50 (12-pack) | Complete parasite umbrella; eliminates need for separate flea and tick pills | Check Price → |
| Credelio + ProHeart 12 Stack | Lotilaner (Chew) + Moxidectin (Shot) | Annual Shot + Monthly Isoxazoline Chew | $210.00 (Credelio 12pk) | $204.00 (Credelio 12pk) | Ideal for dogs that spit out combination chews but accept plain flea pills | Check Price → |
*Pricing figures are audited periodically. Destination pharmacies may alter promotions or manufacturer rebates without advance notice.
Top Recommended Options & Discounts
ProHeart 12 Annual Injection (Zoetis)
Best For: Dogs that spit out pills or owners who forget monthly heartworm doses
- ✓ Single subcutaneous injection provides continuous heartworm and hookworm kill for 365 days
- ✓ Eliminates human error, digestive regurgitation, and compliance gaps
- ✓ Qualifies for $15 to $30 Zoetis Petcare Rewards rebate debit cards
Simparica Trio 12-Month Supply
Best For: Pet parents wanting fleas, ticks, and heartworms covered in 1 monthly chew
- ✓ Combines sarolaner for fleas and ticks with moxidectin for heartworms
- ✓ Stack Chewy 35% AutoShip promo with $45 Zoetis Petcare Rewards
- ✓ Fastest tick kill speed among combination chewables
Credelio Monthly Flea & Tick Chews
Best For: Adding broad-spectrum tick and flea coverage alongside ProHeart 12 injections
- ✓ Extra-small beef-flavored chewable accepted by 99% of dogs
- ✓ Rapid kill of black-legged deer ticks, American dog ticks, and Lone Star ticks
- ✓ Available on Walmart PetRx with free shipping
How ProHeart 12 Works and Veterinary Injection Costs by Weight
ProHeart 12 contains sustained-release moxidectin encapsulated within lipid microspheres. Once injected subcutaneously into the loose skin over the dog's shoulder or flank, the microspheres dissolve slowly at a constant rate, maintaining therapeutic plasma levels of moxidectin for a minimum of 365 days.
Unlike consumer oral medications that are shipped directly to your doorstep from online pet dispensaries, ProHeart 12 is a professional-use veterinary drug. It must be stored under strict refrigeration, reconstituted with sterile diluent, and administered by a licensed veterinary technician. Clinic charges typically scale with body weight: $75 to $85 for dogs under 25 lbs, $95 to $110 for dogs 25 to 60 lbs, and $115 to $130 for giant breeds over 60 lbs.
The Critical Drawback: Zero Flea and Tick Protection
The most common misconception among dog owners is that ProHeart 12 is an all-in-one preventative. In reality, ProHeart 12 only targets heartworm larvae (Dirofilaria immitis) and treats existing hookworm infections (Ancylostoma caninum and Uncinaria stenocephala). It offers zero protection against fleas, ticks, tapeworms, or whipworms.
To protect your dog against Lyme disease, Rocky Mountain spotted fever, and flea allergy dermatitis, you must pair ProHeart 12 with a standalone isoxazoline flea/tick preventative such as Credelio, Bravecto, or NexGard (compare options in our Credelio chewable price guide). When budgeting, factor in the combined cost of the annual injection plus 12 months of flea/tick oral chews.
Maximizing Zoetis Petcare Rewards on ProHeart 12
Because ProHeart 12 is manufactured by Zoetis, pet owners are eligible for official cashback through the Zoetis Petcare Rewards program. Every receipt submitted from your veterinary clinic earns points redeemable for a reloadable Visa debit card ($15 to $30 back).
If you also administer Simparica Trio or Apoquel for other pets in your household, accumulating Zoetis reward points can easily generate over $100 in annual rebates. Review our comprehensive breakdown of Zoetis Petcare Rewards coupons and rebates.