Flea treatment for senior Jack Russell Terriers

An 11-year-old Jack Russell who's been on long-term flea prevention — that's actually a really good position to be in. You've kept on top of it, which means you're likely dealing with maintenance rather than a full infestation. Worth knowing though: treating fleas effectively means treating both the dog AND the home, because roughly 95% of fleas live in carpets, bedding and soft furnishings rather than on the dog itself. One product rarely covers both. Before I point you in the right direction — what have you been using so far, and has anything changed recently that's made you question whether it's still working?

That's a very fair concern — Frontline's active ingredient, fipronil, has been around long enough that there's widespread resistance in the UK flea population now. It genuinely doesn't work as reliably as it once did, and that's not a reflection on you for using it. As for whether senior dogs need a different formula — the honest answer is no, there's no separate 'senior' flea treatment. What matters more at her age is choosing something that's both highly effective and well-tolerated. At 6kg with no health conditions, she's an excellent candidate for a modern oral chewable. Can I ask — is she comfortable taking treats or tablet-style chews, or does she tend to spit things out?

Then I'd point you straight to NexGard (afoxolaner) — it's a monthly beef-flavoured chewable, and for a food-motivated dog like yours it's about as easy as it gets. It works by targeting the flea's nervous system via the bloodstream, so resistance isn't the issue it is with topical treatments. Fleas have to bite to be exposed, which some people flag, but they die within hours and it gives consistent, measurable kill rates. For an 11-year-old with no underlying conditions, it's very well tolerated — the active ingredient isn't processed heavily by the liver compared to some older worming and flea combinations. You'd use the small dog pack for her weight. One thing to pair it with: a home spray like Indorex or Acclaim, used once every six months or so, handles the environmental side. That combination will give you far more reliable protection than Frontline alone ever did.

Yes, NexGard is prescription-only in the UK — you'll need a vet to authorise it, either your own practice or an online vet service. Given she's 11, it's genuinely worth a quick check-in with your vet anyway before switching, not because oral treatments are risky for older dogs, but because it's a good prompt to confirm she has no early kidney or liver changes that haven't shown symptoms yet. If she comes back with a clean bill of health, which is likely given you describe her as fit, your vet will almost certainly be happy to prescribe it. It's one of the most commonly recommended switches when Frontline stops working.

Exactly that. NexGard monthly for her, Indorex sprayed on carpets, soft furnishings and the base of skirting boards — one can covers an average-sized house and lasts up to 12 months on treated surfaces. Do the house spray once when you make the switch, then again if you ever see flea activity. That two-pronged approach is what actually breaks the lifecycle. You've done the hard work building a prevention habit over the years — this is just an upgrade to something that'll hold up better.