Looking for broad parasite protection in one simple monthly step? This Stronghold Plus review explains what it is, what it’s labeled to cover in cats, key safety points, and how to decide if it’s worth it for your routine. If you’re comparing options in the same brand family, we’ll also touch on how “Plus” differs from the standard version without turning this into a technical deep dive.
What Stronghold Plus is (and what it targets)
Stronghold Plus is a topical, monthly parasite preventative for cats made with two active ingredients: selamectin and sarolaner. That combination is designed to cover both external parasites (on the skin) and internal parasites (within the body) as part of a single monthly routine.
On its label for cats, Stronghold Plus is intended for:
- Fleas (treats and helps prevent infestations)
- Ticks
- Ear mites
- Roundworms
- Hookworms
- Heartworm disease prevention (as part of monthly prevention)
If you’re considering the standard version in the same brand family, the “Plus” is generally chosen when you want the added tick coverage from sarolaner alongside selamectin’s broad parasite spectrum. Your cat’s lifestyle and parasite exposure are the best guides for whether that “Plus” feature is worth it.
If you want to browse available options by weight range and pack size, you can find Stronghold Plus products in our brand collection.
Benefits that can make it worth it
One application, multi-parasite coverage. The standout benefit is convenience: one monthly spot-on can address multiple common parasite concerns. For many cat owners, simplifying the routine reduces missed doses, which is crucial for any preventative to work as intended.
Useful when you want both flea and tick protection. If your cat has any exposure risk (even indirect exposure from other pets or visitors), having coverage for both can make planning easier. It can also help reduce the urge to layer products, which can increase the chance of over-treating or choosing incompatible combinations.
Topical format for cats that resist pills. Many cats strongly dislike oral medication. A spot-on can be less stressful—especially if your cat has learned to fight pill time.
Quick tip: Part your cat’s fur and apply to clean, dry skin where they can’t lick (typically at the back of the neck). Avoid bathing right before or after application so the product can distribute properly.
Helps support a consistent heartworm prevention plan. Heartworm prevention depends on steady monthly dosing. If you like “set it and repeat it” routines, combining heartworm prevention with flea/tick coverage can make adherence easier.
Safety, age/weight guidance, and precautions
Stronghold Plus is a veterinary parasiticide, and using it correctly matters. Before starting (or switching) preventatives, it’s smart to confirm the right choice with your veterinarian—especially if your cat has a medical condition or takes other medications.
Minimum age/weight: Use only in cats and kittens that meet the product’s labeled minimum age and weight requirements on the package. If your kitten is still growing or your cat’s weight has changed recently, re-weigh before each purchase to make sure you’re using the correct pack.
- Use only the correct cat weight band. Do not “split” doses, combine tubes, or use a tube intended for a different weight range.
- Do not use dog products on cats. Even if the ingredients sound similar, the formulation and dosing can differ.
- Be cautious with sick, underweight, or recovering cats. Cats that are unwell, debilitated, or significantly underweight may need a different plan or timing—your veterinarian can advise.
- Watch for side effects. Some cats may experience mild, temporary irritation at the application site, transient hair changes, drooling if licked, or brief gastrointestinal upset. Contact a veterinarian promptly if you notice significant lethargy, persistent vomiting, tremors, wobbliness, swelling, or any reaction that concerns you.
Also consider household dynamics: in multi-cat homes, cats may groom each other. Prevent licking by separating pets until the application site is dry.
How to apply it correctly (step-by-step)
Most “it didn’t work” complaints with spot-ons come down to application errors—usually applying to fur instead of skin or allowing licking immediately afterward. Use this simple checklist to help the product perform as intended.
- Weigh your cat and confirm the correct pack. Match the tube to your cat’s current weight band.
- Choose the right moment. Apply when your cat is calm and you can supervise afterward.
- Start with dry skin and coat. Don’t apply to wet fur. If your cat needs a bath, plan it away from application time.
- Part the fur at the base of the neck. This helps you reach skin and reduces the chance your cat can lick the area.
- Apply directly to skin. Empty the tube as directed on the label in one spot (or as instructed). Avoid rubbing it in.
- Prevent grooming until dry. Keep your cat separated from other pets if they tend to groom each other.
- Wash your hands and note the date. Set a monthly reminder so doses don’t drift.
If you’re ever unsure whether the dose went onto skin or mostly stayed on the coat, contact your veterinarian for guidance rather than re-dosing on your own.
How to choose the right option and size
Most buying mistakes come down to selecting the wrong weight band. Always weigh your cat (or use a recent, reliable weight) before ordering, and re-check weight periodically—especially for growing kittens or cats who’ve recently gained or lost weight.
Next, think about your goals. Stronghold Plus can be a strong fit if you want a single monthly product that targets fleas, ticks, ear mites, certain intestinal worms, and heartworm prevention. If your main concern is only one parasite type, your veterinarian may recommend a narrower option—or still prefer broad coverage for simplicity and consistency.
Who it’s best for:
- Cats who need both flea control and tick coverage as part of one monthly routine
- Owners who want heartworm prevention included in the same step
- Cats that won’t reliably take oral preventatives
Who it may not be best for:
- Cats that do not meet the minimum labeled age/weight requirements
- Cats that are ill, debilitated, or underweight without veterinary direction
- Homes where pets immediately lick each other and separation after dosing is not feasible
- Confirm species: Stronghold Plus is intended for cats—never use dog products on cats.
- Match the weight range: Choose the correct size to align with your cat’s current weight.
- Set a reminder: Monthly protection works best when doses aren’t delayed.
Where to buy Stronghold Plus products online
When shopping online, look for clear labeling (weight range and pack size), well-stored inventory, and straightforward reorder options. It also helps to buy from a retailer specializing in vet-grade parasite prevention so you can keep your routine consistent from month to month.
You can view our full selection of Stronghold Plus products to compare options and choose what fits your cat’s needs and your budget.
Frequently Asked Questions
How fast does Stronghold Plus start working?
Stronghold Plus starts working after application, and many owners notice flea activity drop within the first day. That said, timelines can vary depending on how heavy the infestation is and whether there are fleas in the home environment. For best results, apply on schedule every month and pair with basic home cleanup (vacuuming and washing pet bedding) if you’re dealing with an active flea problem.
Can I use Stronghold Plus if my cat is strictly indoors?
Yes. Indoor cats can still be exposed to fleas and other parasites brought in on people, other pets, or visiting animals. Consistent prevention is often simpler than trying to guess when exposure might occur.
What if I miss a monthly dose?
Apply it as soon as you remember, then continue monthly from that new date. If you’re behind on heartworm prevention or you’re unsure how long your cat has been unprotected, check with your veterinarian for the safest next steps.
If you’re ready to simplify parasite protection, shop our Stronghold Plus collection and choose the right size for your cat’s weight. If your pet has health conditions, is on other medications, or you’re switching preventatives, talk to your veterinarian for individualized advice.