Advantage Spot-On for Cats & Rabbits: Sizing and Dosing
By PDSA Pet Store | Published: 2026-11-01
Category: Buying Guides
Match Advantage 80 to cats and rabbits over 4kg, apply it correctly, and know when a different flea treatment size is the safer choice.
Quick answer
Choose Advantage 80 only if your cat or rabbit weighs 4kg or more and is otherwise healthy enough for a spot-on; for pets under 4kg, pick a smaller pack size rather than splitting a tube.
Why the 4kg cut-off matters more than the brand name
Spot-on products are licensed for specific weight bands, and the tube volume is fixed. Advantage 80 is labelled for cats and rabbits from 4kg and over, so a 3.5kg cat or a small rabbit falls outside that range. Guessing by eye is risky because body condition, fur volume and breed can make a pet look heavier than the scale says.
Weigh your pet on a baby scale or at the vet before you buy. If the weight sits right at 4kg, confirm with your vet that the product is appropriate, especially for rabbits, which can be more sensitive to some treatments than cats.
Where Advantage 80 fits in a flea plan
Only about 5% of fleas live on your pet at any one time; the rest are eggs, larvae and pupae in bedding and carpets. A 4 week flea treatment for cats and rabbits kills fleas on the animal, but it does not sterilise the environment. Plan to wash bedding, vacuum regularly and treat the home if you have an active infestation.
Advantage 80 is a monthly spot-on, so it suits owners who want a routine they can repeat on the same date each month. It is not a one-off fix, and it will not stop new fleas from jumping on from the garden or from other animals.
When a different size or product is the better buy
If you have several pets of different weights, buying one large pack and splitting it is not safe. Each tube is formulated for a weight band, and dividing the dose can under-treat a heavy pet or overdose a small one. Instead, buy the correct size for each animal.
For pets under 4kg, or for cats and rabbits that are pregnant, nursing or unwell, ask your vet before using any spot-on. The catalog does not list every health condition or interaction, so the label and your vet's advice should decide, not the price per tube.
Decision rules for choosing and applying Advantage 80
- Weigh before you buy: Use a scale, not a guess. Advantage 80 is for cats and rabbits from 4kg and over; if your pet is under 4kg, choose a smaller licensed size. A pet that is close to 4kg should be reweighed on the day you treat.
- Check the species on the label: The pack is labelled for both cats and rabbits, but rabbits can react differently to some ingredients. If your rabbit has never had a spot-on, ask your vet to confirm suitability first.
- Apply to skin, not fur: Part the fur at the back of the neck and place the tube tip on the skin, then squeeze steadily. Do not massage the area or let your pet lick it; keep other animals away until it is dry. Record the date so the next 4 week dose is not missed or doubled.
- Do not split tubes between pets: One tube is one dose for one pet in the stated weight band. If you have a small cat and a large rabbit, buy separate products rather than dividing a tube.
- Treat the home as well as the pet: Because most fleas are off the animal, combine the spot-on with bedding washes and vacuuming. If fleas persist after a month of correct use, speak to your vet rather than adding a second product.
Product facts
- Advantage 80, 4 Week Spot-On Flea Treatment For Cats & Rabbits - 4kg and Over: Advantage 80 is a 4 week spot-on flea treatment labelled for cats and rabbits weighing 4kg and over. It gives you a single monthly product for a large cat or rabbit, provided the weight range matches your pet.
Advantage 80, 4 Week Spot-On Flea Treatment For Cats & Rabbits - 4kg and Over
Who should choose Advantage 80
Best for
- Owners of cats weighing 4kg or more
- Owners of rabbits weighing 4kg or more
- Households that want a repeatable monthly spot-on routine
Not for
- Cats or rabbits under 4kg
- Pregnant, nursing or unwell pets without veterinary advice
- Owners who want a one-off flea fix without treating the home
