Flea prevention for 16-week GSD puppy

Great timing — finishing vaccinations at 16 weeks is exactly the right moment to get flea and tick prevention locked in. The most effective choice depends on your dog's current weight, your local tick exposure, and whether you'd prefer a monthly spot-on, an oral tablet, or a collar. Some widely available products are genuinely much weaker than others, so it's worth getting this right from the start. What does your German Shepherd weigh right now, are you in an area with high tick pressure — woodland walks, long grass, rural fields — and do you have any preference for how you apply the treatment?

At 12kg and in a tick-risk area like rural Surrey, you want something that covers both fleas and ticks reliably — not just flea-only products, which is what a lot of pet shops push. For a 16-week-old GSD at that weight, I'd go with NexGard Spectra for dogs 7.5–15kg. It's a monthly chewable tablet that kills fleas before they lay eggs, and it covers multiple tick species including the ones common in the UK. It's also licensed from 8 weeks and 2kg, so he's well within range. The main thing to know: it requires a vet prescription in the UK, so you'd get it via an online vet pharmacy like VetUK or PetDrugsOnline — straightforward and cheaper than a physical vet dispensing fee.

Yes, it's well-established for puppies from 8 weeks — NexGard Spectra has a strong safety profile and is used widely in young dogs. On the dosing question: German Shepherds grow quickly, and the bands matter. He's in the 7.5–15kg pack right now, but once he hits 15kg — probably within a couple of months at his current rate — you'd move up to the 15–30kg pack. Just weigh him monthly, which you're likely doing anyway at that age, and switch pack size when he crosses the threshold. You don't need to restock mid-month; just move up at the next monthly dose.

Yes, worming is separate. NexGard Spectra does include lungworm and some intestinal worm coverage, which is actually a bonus — standard NexGard doesn't. But for full worm cover including tapeworm, you'd still want a dedicated wormer like Milbemax or Drontal every three months. At 16 weeks your vet will likely have already done at least one round, so just continue on a quarterly schedule alongside the monthly NexGard Spectra. Keep them simple: flea and tick monthly, wormer quarterly.