Heartworm prevention should run all twelve months for every dog and cat in the Charlotte area, because one mosquito bite can pass the larvae and most preventives only clear larvae picked up in the weeks before each dose. Petfolk Veterinary & Urgent Care - Ballantyne is a vet clinic in Charlotte, North Carolina, that prescribes heartworm preventives for dogs and cats and helps you pick a form your pet will actually take.
Dogs need a negative heartworm test before starting or restarting prevention. Petfolk Ballantyne is a vet in Ballantyne that can do both at one visit; call (980) 300-6982 or book online.
How does a dog or cat get heartworm?
From a mosquito bite. The mosquito picks up tiny larvae from an infected animal and passes them to the next pet it bites. Over about six months, the larvae grow into thin worms that live in the heart and the large blood vessels of the lungs and can reach a foot long. By the time a dog coughs or tires on walks, damage has often been done, which is why Petfolk Ballantyne focuses on prevention.
North Carolina is a top-ten state
The American Heartworm Society ranks North Carolina among the ten states with the most heartworm cases in its latest survey and describes the central Carolinas as an area of increasing diagnoses. It recommends year-round prevention and a yearly test for all dogs. In Mecklenburg County, about 1 in 200 dogs tested in 2025 were positive (0.63%), according to Companion Animal Parasite Council data.
In July 2026, the state lab confirmed West Nile virus in mosquitoes collected by Mecklenburg County Public Health. West Nile mainly affects people and horses, but it shows disease-carrying mosquitoes breed here. The county asks residents to empty standing water weekly, including pet bowls left outside, and Petfolk Ballantyne seconds that.
Why keep giving heartworm prevention through a Charlotte winter?
Because most monthly products work backward, killing larvae picked up in the previous weeks, so a missed December dose can leave November larvae unprotected. March warm spells bring the first mosquitoes; June to September is peak season, and every evening walk through Blakeney counts; October and November still have biting days; and December to February has fewer mosquitoes, not zero, with some sheltering in garages and crawl spaces. The Petfolk Ballantyne vet keeps dosing year-round for that reason.
A chew, a topical or one shot a year
At Petfolk Ballantyne, 86% of dog parasite-prevention purchases were Simparica Trio, a monthly chew that covers heartworm, fleas and ticks, and about 6% were ProHeart 12, a once-a-year injection (October 2025 to September 2026). Across Petfolk's Charlotte-area clinics, most cat orders were Revolution Plus, a monthly topical.
All of these work when given on time, and the best one is the one you won't forget. The vet recommends a product by species, weight, age and what else you want covered. The heartworm testing page explains the test that comes first. You'll get an estimate before any test or treatment. The final bill can differ if the plan changes during the visit.
Do indoor cats need heartworm prevention?
Yes. Mosquitoes get indoors, and there is no approved treatment to clear heartworm from a cat, so prevention is the only real protection. Even immature worms can inflame a cat's lungs and cause coughing, wheezing or vomiting that looks like asthma. Gentle Handling is standard at every Petfolk clinic, and a monthly topical means no pills for cats who refuse them; Petfolk Ballantyne can apply the first dose at the visit.
Cough, fatigue, then worse
Early heartworm disease often has no signs. Later, dogs may have a soft, dry cough, tire easily, lose weight or develop a swollen belly; book an exam at Petfolk Ballantyne if you notice any of these.
Go to a 24-hour emergency hospital right away if your dog suddenly collapses or has pale gums, labored breathing or dark brown urine. In a dog with a heavy worm load, these can signal caval syndrome, a sudden blockage of blood flow by worms. Petfolk Ballantyne does not provide overnight care.
Book a visit at Petfolk Veterinary & Urgent Care - Ballantyne, or see all veterinary services in Ballantyne.
Heartworm prevention questions
Your south Charlotte clinic on Ballantyne Commons Parkway