Best flea treatment for Yorkshire Terriers

Herbal flea collars are largely ineffective — they rely on scent deterrents rather than any active ingredient that kills fleas, so it's no surprise it didn't work. The most effective prevention for your dog depends on their size and weight, your local tick risk, and whether you'd prefer a spot-on, collar, or oral treatment — and some widely sold products are significantly weaker than others. To point you in the right direction: what size is your Yorkie, are you in an area with high tick activity, and do you have any preference between a monthly chew, a spot-on, or a prescription collar?

Good to know. At 3.5kg she's in the small dog range, and regular woodland walks in Surrey puts her at genuine tick risk — that's an area with established populations of Ixodes ricinus, the species that can carry Lyme disease. For an 8-year-old Yorkie, I'd also want to confirm she doesn't have any liver or kidney issues, since that can affect which treatments are suitable. Is she generally in good health, and is she currently on any medication?

That's really helpful. Given that she's healthy, weighs 3.5kg, has regular tick exposure, and you want reliable flea kill rather than just deterrence, I'd recommend NexGard Spectra for small dogs (2–3.5kg range — she's right on the upper edge so confirm the weight band when you order). It's a monthly chew that kills fleas within 8 hours, covers ticks, and also treats lungworm, roundworm, and mites — so you get broad protection in one tablet. It requires a prescription in the UK, but many online vets like PetDrugs Online or VetUK can issue one quickly after a short questionnaire. If you'd rather avoid the prescription route entirely, Seresto collar by Bayer is the strongest non-prescription option — it lasts 8 months and provides continuous flea and tick protection, which addresses your preference for not having to remember monthly treatments. But NexGard Spectra is the stronger clinical choice for a dog with your woodland exposure.

Completely different chemistry — Seresto uses imidacloprid and flumethrin, which are established veterinary actives with a long safety record. The herbal collar would have used plant oils like citronella or eucalyptus, which have no meaningful killing action. Seresto is well-tolerated in older dogs and the low-dose continuous release means systemic exposure is minimal compared to a monthly oral dose. For an 8-year-old Yorkie in good health, it's a sound choice. Go for the small dog version (under 8kg) — it fits Yorkies well and has a safety release mechanism. It's widely available on Amazon UK without a prescription, typically around £35–40 for an 8-month collar. That said, if she picks up a tick infestation rather than just flea risk, NexGard Spectra is faster-acting on ticks — so if Lyme risk is your primary concern, the prescription route is worth considering.

Good call. Just make sure you're buying from a reputable seller on Amazon — there have been counterfeit Seresto collars in circulation, so look for Elanco or Bayer branding and check the seller reviews. Fit it snugly enough that you can slide two fingers underneath, and note the start date somewhere — at 8 months you'll want to replace it before it loses efficacy. If you notice any skin irritation around her neck in the first week, remove it and check with your vet, though this is uncommon in dogs. Good luck — she should be properly protected this time.