Year-Long Heartworm Prevention for Dogs with ProHeart 12 in Conroe, TX
Missing a monthly heartworm pill sounds like a small thing until it isn’t. A single mosquito bite is all it takes to put your dog at risk, and in Texas, mosquitoes are active almost year-round. If remembering a monthly dose has ever stressed you out, or if your dog spits chewables halfway across the kitchen, there’s an easier way to keep them safe. At Kainer Veterinary Hospital, we offer ProHeart 12, a once-a-year injection that delivers a full 12 months of heartworm prevention for dogs with one simple vet visit.
ProHeart 12 is made by Zoetis and delivers slow-release moxidectin, the same active ingredient used in many monthly heartworm preventives, but in a steady, year-long dose. That means one shot, twelve months of protection, and no monthly reminders on the fridge. Before the first injection, we always run a quick heartworm test to make sure your dog is negative, then our vets give the shot in a calm, in-clinic setting. As an AAHA-accredited hospital serving The Woodlands, Conroe, Magnolia, and surrounding areas, we tailor every ProHeart 12 injection to your dog’s weight, age, and health history.
Signs ProHeart 12 May Be Right for Your Dog
- Missed Monthly Doses: If remembering the first of every month is a struggle, yearly protection removes the risk.
- Picky Eaters: Dogs who refuse chewables, spit out pills, or get suspicious of anything hidden in peanut butter.
- Active Outdoor Dogs: Pets who spend time near woods, lakes, tall grass, or campsites where mosquitoes thrive.
- Busy Households: Multi-pet homes or families with kids where monthly doses across pets get chaotic.
- Dogs with Sensitive Stomachs: Pets who don't tolerate oral medications well or have had GI issues with chewables.
Benefits of ProHeart 12 for Dogs
- One Shot, 12 Months Covered: True set-it-and-forget-it heartworm protection.
- Administered by Our Team: No guessing whether the dose was fully swallowed or absorbed.
- Easier on Sensitive Stomachs: Skips the oral medication route entirely.
- Steady, Reliable Protection: Slow-release moxidectin keeps coverage consistent all year.
Who ProHeart 12 Is Right For and When to Start
ProHeart 12 is a great fit for most adult dogs, but timing and testing matter.
Who ProHeart 12 Helps Most:
- Dogs 6 Months and Older: Approved for healthy adult and senior dogs.
- Families Who Miss Monthly Doses: Peace of mind that protection is always in place.
- Dogs in High-Risk Areas: Texas mosquito activity makes consistent prevention essential.
- Active, Outdoor Dogs: Hiking, camping, boating, or daily time outside.
When to Start ProHeart 12:
- After a Negative Heartworm Test: We confirm your dog is heartworm-free before the first injection.
- Annually During a Wellness Visit: Easy to pair with your dog's yearly check-up.
- Before Mosquito Season Peaks: Starting early builds protection ahead of the heaviest months.
- When Switching from Monthly Preventives: Time the first shot to follow your dog's last monthly dose.
Give your dog a full year of heartworm protection without the monthly stress. Book a ProHeart 12 appointment with our team today.
ProHeart 12 Administration Process at Kainer Veterinary Hospital
Book a Wellness Exam
Comprehensive Health Assessment
In-Clinic Injection
Annual Reminder
Voted Favorite in Neighborhood By 
Kainer Veterinary Hospital is a Neighborhood Favorite in the Conroe area, serving the Sunpark and Evangeline Oaks neighborhoods. Known for its excellent care and community-focused service, it has earned the trust and loyalty of local pet owners. It also won this recognition in 2017, 2018, 2019, 2021, 2022, and 2023.
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Frequently asked Questions
Heartworm disease is serious but completely preventable, and we want to make protecting your dog as simple as possible. Here are the questions we hear most from pet parents about ProHeart 12. If yours isn’t below, just give us a call.
ProHeart 12 is a once-a-year heartworm prevention injection made by Zoetis. It uses slow-release moxidectin to provide a full 12 months of protection from heartworm disease with a single vet-administered shot.
Healthy dogs 6 months and older can generally receive ProHeart 12. Our vets do a wellness exam and heartworm test before the first injection to confirm your dog is heartworm-free and in good health.
Yes. ProHeart 12 only covers heartworm. Your dog will still need flea, tick, and intestinal parasite prevention, and we’re happy to help you plan the full picture.
Most dogs tolerate ProHeart 12 very well. Mild, temporary reactions at the injection site are the most common. Our team walks you through what to watch for and stays available for questions.
We’ll run a heartworm test first. If your dog is negative, we can start ProHeart 12 right away. If not, we’ll walk you through treatment options before moving to prevention.
