Dogs and cats in Fort Mill need heartworm prevention every month of the year, started by 8 weeks of age, because mosquitoes spread heartworm and South Carolina is one of the hardest-hit states in the country. Petfolk Veterinary & Urgent Care - Fort Mill sets up heartworm prevention in Fort Mill with a short checklist at each yearly visit: test, product, schedule and refills.
Petfolk Fort Mill is a veterinary clinic in Fort Mill, South Carolina, at 1642 SC-160, Suite 104. Heartworms are long, thin worms that live in the heart and the large blood vessels of the lungs, and they are much easier to prevent than to treat.
Call (803) 590-8031 or book online.
How common is heartworm in South Carolina?
Heartworm is very common here: South Carolina ranked fifth in the nation for canine heartworm cases in the American Heartworm Society's 2025 incidence survey. The same survey named the central Carolinas a new heartworm hot spot, meaning diagnosed infections there have become more concentrated (American Heartworm Society). For Fort Mill pets, that makes year-round prevention the safe default.
Does my dog need a heartworm test before starting prevention?
Yes, an adult dog needs a negative heartworm test before starting or restarting prevention, and a test every year after that. The American Heartworm Society recommends yearly testing for every dog, even dogs already on prevention, for two reasons:
No product is perfect. A missed dose, a spit-out pill or a chew that got vomited up can leave a gap.
Starting prevention in a dog that already carries heartworms can cause a serious reaction, so the test comes first.
The test uses a small blood sample. Our heartworm testing page covers timing and what a positive result means.
Which heartworm preventive do Fort Mill pets use most?
Most Fort Mill dogs use a monthly chew, and most cats use a monthly topical. At Petfolk Fort Mill, from October 2025 to October 2026:
About 4 in 5 heartworm-prevention orders for dogs (81%) were Simparica Trio, a monthly chew that also covers fleas and ticks.
1 in 10 dog orders (10%) were the ProHeart injection, given at the clinic.
For cats, 87% of parasite-prevention orders were Revolution Plus, a monthly topical.
The vet matches the product to your pet's weight, age, health and the other parasites you want covered. All of them need a prescription.
Is heartworm prevention needed all year in Fort Mill?
Yes, heartworm prevention is needed all year in Fort Mill. The American Heartworm Society recommends it every month and reports heartworms in all 50 states. South Carolina winters have warm spells when mosquitoes bite, and stopping in the cool months saves little. At each visit, Petfolk Fort Mill reviews your pet's refill history; if there are gaps, the vet may move the next test sooner.
Do indoor cats need heartworm prevention?
Yes, indoor cats need prevention too, because mosquitoes get inside through doors and screens. In cats, even a few worms can cause breathing problems that look like asthma, and there is no approved treatment to clear heartworms from a cat. That makes prevention the main tool.
When should puppies and kittens start?
Puppies and kittens should start as early as the product label allows and no later than 8 weeks of age, the American Heartworm Society says. Young pets can start before their first heartworm test, because worms take months to mature. At Petfolk Fort Mill, the vet adds it at the first vaccine visit.
How can I cut down mosquitoes at home?
Empty standing water once a week to cut down mosquitoes. The Asian tiger mosquito, the most common daytime-biting mosquito in the Carolinas, spreads dog heartworm, according to Clemson Extension's Home & Garden Information Center. It breeds in small containers, so:
Tip out plant saucers, bird baths, buckets and kiddie pools.
Clear clogged gutters.
Swap the water in outdoor pet bowls.
A yard in Regent Park or a patio along SC-160 can breed mosquitoes in one forgotten flowerpot saucer.
What if I miss a dose?
Give the missed dose as soon as you remember, then call Petfolk Fort Mill at (803) 590-8031. If more than one dose was missed, the vet may recommend a heartworm test sooner than usual. A monthly phone reminder or the injectable option helps.
Which heartworm signs need a 24-hour hospital?
Most heartworm signs call for a booked visit, not an emergency. Book a sick visit at Petfolk Fort Mill for a soft, steady cough, tiring quickly on walks, weight loss or a swollen belly in dogs, or coughing, wheezing or vomiting in cats.
Go to a 24-hour emergency hospital if your pet collapses, has pale gums or is struggling to breathe.
How do I start heartworm prevention in Fort Mill?
Call (803) 590-8031 or book online. A veterinarian in Fort Mill can review the refill history and test date at one visit, and you get an estimate before any treatment.
Book a visit at Petfolk Veterinary & Urgent Care - Fort Mill, or see all veterinary services in Fort Mill.
Heartworm prevention questions, answered plainly
Heartworm visits on Highway 160 West