Parasite prevention is one of those things that’s easy to skip until something goes wrong. Heartworm disease, flea infestations, and tick-borne illness are all preventable with the right products, but only if you stay consistent and use them correctly. This covers what each type of parasite actually does, how prevention works, and what pet owners in Brooklyn specifically need to know.
Quick Answer: Heartworm, Flea, and Tick Prevention
Heartworm prevention requires a monthly or injectable prescription medication given year-round. Flea and tick prevention uses topical, oral, or collar-based products, most of which are available over the counter, though prescription options tend to be more effective. Cats and dogs need different products. Never use a dog flea and tick product on a cat. Some are fatal to cats even in small amounts.
How Heartworm Prevention Works (and Why It’s a Prescription)
Heartworm disease is caused by a parasitic worm transmitted through mosquito bites. The larvae enter the bloodstream and eventually mature into worms that live in the heart and pulmonary arteries. In dogs, this causes coughing, exercise intolerance, and eventually heart failure. In cats, it can cause sudden death with little warning. Heartworm prevention doesn’t kill adult worms. It kills the larval stage before it can develop. This is why the medication must be given consistently. If you miss doses, larvae from earlier mosquito bites may survive and mature.
Common prescription options include monthly oral chewables like Heartgard and Interceptor Plus, monthly topicals like Revolution (which also covers fleas), and an injectable option called ProHeart 12, which provides a full year of coverage from a single appointment.
Flea and Tick Prevention: Topical, Oral, and Collar Options
There’s no single best product for every pet. The right choice depends on your pet’s species, weight, health history, lifestyle, and your household setup. Common categories include:
- Oral chewables: NexGard, Simparica, Credelio. Monthly dosing. Kills fleas and ticks systemically. Good option when topical application is inconvenient or when you have children or other pets contacting a wet topical product.
- Topical spot-on treatments: Frontline Plus, Advantage II, K9 Advantix II. Applied to skin at the back of the neck. Some repel ticks in addition to killing them.
- Collars: Seresto. Provides 8 months of protection against fleas and ticks. Useful when consistent monthly dosing is difficult.
For cats, options are more limited. Many flea and tick products labeled for dogs are toxic to cats due to differences in how cats metabolize certain compounds. Revolution Plus (selamectin + sarolaner) is a commonly recommended option for cats because it covers fleas, ticks, heartworm, and roundworms in a single monthly topical.
Tick Risks Specific to Brooklyn and New York City
Ticks don’t just live in the woods. They’re found in Prospect Park, Greenwood Cemetery, and any patch of grass or brush where wildlife passes through. The blacklegged tick (deer tick) is the species responsible for Lyme disease, and it’s established throughout New York City’s parks. Lyme disease in dogs causes lameness, fever, lethargy, and kidney disease in severe cases. Dogs in Brooklyn should be on year-round tick prevention, not just during warmer months, because ticks in the Northeast can be active above 35°F.
When to Start Prevention and How to Stay Consistent
Puppies and kittens can start heartworm prevention as young as 6 to 8 weeks, depending on the product. Flea and tick prevention can typically start at 8 weeks. The key is to not let coverage lapse. A single missed month of heartworm prevention is enough time for larvae to develop past the stage the medication can eliminate. If you’ve missed more than one dose, have your dog tested before restarting.
Multi-Pet Households and the Cat Safety Issue
If you have both dogs and cats, use separate products and confirm with your vet that the cat product is feline-safe. Permethrin, found in many dog flea products, is highly toxic to cats. This is not a situation where “it should be fine” is a safe assumption.
Final Thoughts on Heartworm, Flea, and Tick Prevention
Consistent prevention is simpler and cheaper than treating the diseases these parasites cause. The cost of monthly heartworm prevention is a fraction of the cost of heartworm treatment. The cost of a flea product is far less than the cost of treating a household infestation. Start prevention early, don’t let coverage lapse, and talk to your vet about which specific products are right for your pet. Contact The Vet Set to schedule a parasite prevention consultation or book online.