Pet Health Guide
Which Dewormer Does My Pet Actually Need?
Not sure where to start? This plain-language guide helps dog and cat owners pick the right product in under two minutes — no vet jargon, no confusion.
Buying a dewormer shouldn't be complicated. But walk into a pharmacy and you'll see five different boxes with long ingredient names, and no clear explanation of what's different about each one.
Here's the simple truth: the right product depends on what animal you have, what symptoms you're seeing, and what type of parasite you're dealing with. This guide cuts through the noise.
Quick answer
Have a cat? Choose Mewrantel. Dog with worm symptoms? Worminator. Dog with skin irritation or mange? Ivernom Vet. Multiple species at home? Fenbenta. Read on for the full picture.
Why the right product matters
Not all dewormers cover the same parasites. Some are formulated only for cats, others only for dogs. Some treat internal worms in the gut; others treat external parasites on the skin. Using the wrong product means the worms simply survive — and your pet stays unwell.
The good news? Once you know what you're dealing with, the choice is actually straightforward.
The four products — and when to use each one
Broad-spectrum deworming, in a chewable cats actually eat
Mewrantel is designed specifically for cats. It targets both roundworms and tapeworms — the two most common internal parasites in cats — using a combination of praziquantel and pyrantel pamoate.
What makes it stand out is the chewable, flavoured format. Anyone who has tried to get a cat to swallow a plain tablet knows how that usually goes. Mewrantel sidesteps the battle entirely.
- Roundworms ✓
- Tapeworms ✓
- Chewable & flavoured
- Cat-specific formula
The broadest worm coverage in the range — 4 worm types
Worminator is the most comprehensive dewormer for dogs. It covers roundworm, tapeworm, hookworm, and whipworm — four worm types in one tablet, using febantel, praziquantel, and pyrantel pamoate together.
Whipworm is the key differentiator. Most consumer dewormers skip it. Whipworm lives in the large intestine and can cause chronic diarrhoea that owners often mistake for something else entirely. Worminator is the only product in this range that covers it.
- Roundworms ✓
- Tapeworms ✓
- Hookworms ✓
- Whipworms ✓
- Broadest dog coverage
The only product in the range for skin parasites and mange
Ivernom Vet is different from the others — it treats external parasites, not gut worms. Its active ingredient is ivermectin, which targets mange mites (demodicosis and sarcoptic mange) as well as other ectoparasites that live in and on the skin.
If your dog is scratching heavily, losing patches of fur, or has red, irritated skin — this is the product to reach for, not a standard gut dewormer. It's also available at the lowest entry price in the range, and offers the steepest bulk discount for households treating multiple dogs or managing ongoing skin conditions.
- Mange (demodicosis) ✓
- Sarcoptic mange ✓
- Ectoparasites ✓
- Chewable format
- Lowest entry price
One product, multiple species — the versatile choice for mixed households
Fenbenta uses fenbendazole — a different active ingredient from the other three products — which gives it a different mechanism of action and makes it suitable across multiple animal species.
If you have both dogs and cats, or other animals in the home, Fenbenta offers the flexibility to treat across species without buying separate products for each. It's given directly or mixed with food, and dosage is adjusted by weight, making it adaptable to different animals.
- Multiple species ✓
- Fenbendazole formula
- Dosage by weight
- Mix with food
Find your product in 30 seconds
Use this table to match your situation to the right choice.
| Your situation | What you need | Product |
|---|---|---|
| Cat with worms (vomiting, pot belly, visible worm segments) | Broad-spectrum cat dewormer, easy to administer | Mewrantel |
| Dog with worm symptoms — scooting, diarrhoea, weight loss | Full 4-worm coverage including whipworm | Worminator |
| Dog scratching constantly, losing fur, red or crusty skin | Ivermectin for skin parasites and mange | Ivernom Vet 10mg |
| Multiple pets at home (dogs, cats, other animals) | Multi-species fenbendazole dewormer | Fenbenta 150mg |
| Routine prevention, no current symptoms (dog) | Broad-spectrum tablet given regularly | Worminator |
| Routine prevention, no current symptoms (cat) | Chewable broad-spectrum tablet | Mewrantel |
A note on tablet formats
One practical thing that often gets overlooked: how easy is the tablet to actually give?
Mewrantel and Ivernom Vet are both chewable and flavoured. Many pets take them willingly as a treat. This matters more than it sounds — a missed dose means incomplete treatment, and incomplete treatment means the parasites survive.
Worminator and Fenbenta are plain, uncoated tablets. They work just as well, but some pets are more reluctant. The easiest method: hide the tablet in a small piece of soft food (a cube of chicken, a bit of cheese, or a pill pocket). Most dogs won't notice. Cats are trickier — if your cat consistently refuses tablets, Mewrantel's chewable format is the better choice.
Quick tip
Always give deworming tablets with or just after food. It improves absorption and reduces the chance of an upset stomach — especially for dogs who are sensitive.
How often should you deworm your pet?
Most vets recommend treating adult dogs and cats every three months as a routine. If your pet has an active infestation or is frequently outdoors, every six to eight weeks may be more appropriate.
- Puppies and kittens should be dewormed more frequently — typically every two weeks until 12 weeks old
- Pets that hunt, scavenge, or eat raw food are at higher risk and benefit from more regular treatment
- If one pet in the household has worms, treat all pets at the same time to prevent reinfection
- Mange (Ivernom Vet) requires a course of treatment over several weeks — not a single dose
When to see a vet
If your pet has been treated and symptoms persist after two weeks, if they are very young, elderly, pregnant, or seriously unwell — see a vet. OTC deworming is excellent for prevention and mild to moderate infestations, but severe or recurring cases need professional assessment.
Frequently asked questions
Can I use Worminator on my cat?
No. Worminator is formulated specifically for dogs. The active ingredient febantel is not recommended for cats. Use Mewrantel for cats — it's designed for feline physiology and is safe and effective for them.
My dog has both worms and skin issues — do I need two products?
Possibly yes. Worminator treats internal gut worms; Ivernom Vet treats external skin parasites like mange. If your dog has both problems, you may need to use both products — but stagger them and speak to your vet if you're unsure about timing.
Is Fenbenta the same as other fenbendazole dewormers?
Fenbenta uses the same active ingredient (fenbendazole) as other products in its class, but formulation, dosage strength, and quality can vary between brands. Always follow the dosage instructions on the pack, and dose by your pet's body weight for best results.
Does buying in bulk actually save money?
Yes, meaningfully so. All four products use tiered pricing — buying 6 boxes at once saves between 27% and 34% per tablet compared to buying one box at a time. Ivernom Vet has the steepest discount at the bulk tier, making it especially cost-effective for households with multiple dogs or ongoing treatment needs.
How do I know if my pet actually has worms?
Common signs include: scooting or dragging the bottom along the floor, visible worm segments near the tail or in faeces, a bloated or pot-bellied appearance, vomiting, unexplained weight loss despite eating well, and dull or rough coat. Mange shows up differently — as itching, hair loss, and skin irritation. Not all infestations are visible, which is why regular preventive treatment matters.
Ready to get the right product?
All four products are available with bulk savings — buy more, pay less per tablet.
Shop Mewrantel (Cats) Shop Worminator (Dogs) View full range →
