Best Flea Treatment for Dogs UK: How to Choose the Right Option
Not every flea treatment suits every dog. Compare formats, lifestyle fit, and what’s actually licensed for general sale vs prescription-only in the UK.
August 17, 2026
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Frontline Spot On for Dogs – Flea & Tick Protection
From Price range: £8.19 through £36.18
Frontline Spot On for Dogs – Flea & Tick Protection
From Price range: £8.19 through £36.18
FOR DOGS
Frontline Spot On for dogs is a fipronil spot-on treatment for fleas, ticks and biting lice. Choose the pack for your dog’s weight. Use it as the product leaflet directs.
- Kills fleas within 24 hours
- Kills ticks within 48 hours
- Kills lice
Available in 1, 3, and 6 pipette packs
For dogs only. Do not use in cats, as this could lead to overdosing
Order Monday to Friday before 14:00pm to guarantee next
day delivery.
Ordering Prescription-Only Products
This item requires a current prescription from your vet before we can dispatch it. The good news? Sorting it out is simple and only takes a moment.
- Select or register your pet
- Attach a clear image or PDF of the prescription
- Complete your order at checkout
As soon as your prescription reaches us, our team will verify the details and get your pet’s treatment posted out to you.
Order Monday to Friday before 14:00pm to guarantee next
day delivery.
Product Features
FOR DOGS
Frontline Spot On for dogs is a fipronil spot-on treatment for fleas, ticks and biting lice. Choose the pack for your dog’s weight. Use it as the product leaflet directs.
- Kills fleas within 24 hours
- Kills ticks within 48 hours
- Kills lice
Available in 1, 3, and 6 pipette packs
For dogs only. Do not use in cats, as this could lead to overdosing
Product Details
FRONTLINE Spot On for Dogs – Kills Fleas, Ticks & Biting Lice
FRONTLINE Spot On is a fast-acting, vet-approved treatment containing fipronil, which kills fleas, ticks, and biting lice on your dog. Vets usually recommend monthly application if you are managing flea allergy dermatitis or an active infestation. Dosages are available for dogs of all sizes, from small breeds up to extra-large. Puppies can be treated from 8 weeks old, as long as they weigh at least 2kg.
Effective duration: around 2 months for fleas, up to 1 month for ticks
- Any new fleas landing on the dog are eliminated within 24 hours.
- Effectively controls biting/chewing lice infestations
Dosage guides
- 2–10kg: 0.67ml pipette
- 10–20kg: 1.34ml pipette
- 20–40kg: 2.68ml pipette
- 40–60kg: 4.02ml pipette
- Over 60kg: two 2.68ml pipettes combined
Warnings
- Bathing or shampooing up to 1 hour before application does not affect the product’s effectiveness
- Do not bathe your dog or let them swim for two days after application
- Weekly bathing with a gentle, soap-free shampoo won’t affect protection — avoid bathing more often than once a week, and skip skin-softening shampoos
- Outdoor dogs or those in wildlife areas are at higher risk of fleas and ticks
- The dose is calibrated to dog bodyweight, and using it on a cat risks overdosing.
Dealing with a flea problem at home? Spot On treats fleas and ticks on your dog but won’t stop flea eggs and larvae developing in your home. For that, see Frontline Plus.
Instructions
Applying
Applied at the base of the skull and a little further down the neck, so it’s out of reach of licking
- Part your dog’s fur at the base of the neck, in front of the shoulder blades, until the skin is visible.
- Place the tip of the pipette on the skin and squeeze to empty the contents completely.
Important Safety Information
- Do not apply more than once a week.
- Do not use on puppies under 8 weeks old
- Do not overdose (always match the pipette to bodyweight)
- Avoid contact with the animal’s eyes
- Safe for use during pregnancy and lactation
- Not suitable for use on rabbits, as adverse reactions and even death could occur
- If your dog is unwell, speak to your vet before applying any flea treatment
- Minimum treatment interval: 4 weeks
AVM-GSL: Medicines for pets that are safe to buy anywhere (pet shops, supermarkets) with no prescription or special advice needed.
Sizes
At Ahscroft 4 Pets FRONTLINE SPOT ON for dogs is available in 3 different pack sizes:
- 1 pipette
- 3 pipettes
- 6 pipettes
Key Benefits
- Kills fleas, ticks & lice fast
- Prevents flea eggs & reinfestation
- Lasts up to 8 weeks
- Safe for puppies & adult dogs
- Easy topical application
- Sizes S, M, L
- Fast UK delivery from Ashcroft 4 Pets
Ingredients
Active Ingredient: Fipronil – kills fleas, ticks, and biting lice
Excipients / Inactive Ingredients:
- Butylhydroxyanisole (E320) – antioxidant
- Butylhydroxytoluene (E321) – antioxidant
- Solvents and carriers to deliver the active ingredient in the topical solution
Note: The exact composition may vary slightly by pack size. Always read the product label before use.
Frequently asked questions
What does FRONTLINE Spot On for Dogs treat?
It treats and prevents flea and tick infestations. It also helps control biting lice.
How does FRONTLINE Spot On work?
It contains fipronil, which spreads across the skin and coat after application. It kills fleas and ticks on contact.
How long does FRONTLINE Spot On last?
It protects against fleas for up to 8 weeks and ticks for up to 4 weeks, depending on exposure.
How often should I apply it?
Apply once every 4 weeks for continuous protection, especially in high-risk seasons.
How do I apply FRONTLINE Spot On correctly?
Apply the solution directly to the skin between the shoulder blades. Do not apply to the fur only. Ensure the area is dry before application.
Can I bathe my dog after applying Frontline Spot On?
Wait 2 days after application, then weekly bathing or swimming is fine and won't reduce protection. Please read the enclosed package leaflet fully before use.
Is it safe for puppies?
It can be used in puppies from 8 weeks of age, provided they meet the minimum weight requirement on the label.
Does FRONTLINE Spot On prevent worms?
No. It does not protect against intestinal worms or heartworm. A separate worming treatment is required.
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