Flea treatment for two dogs and a puppy

Three dogs at different ages and sizes in one house is genuinely one of the trickier flea situations to manage — not because it's impossible, but because unsynchronised treatment cycles can leave gaps that let the infestation bounce back. The core rule still applies: 95% of fleas are living in your home, not on the dogs, so treating the pets alone won't crack it. Can you tell me the rough weights of your two adult dogs, how old the puppy is and what they weigh, and whether you've done anything to treat the house yet?

Good that you caught it early. At 9 weeks, the puppy is old enough for certain treatments but you need to be careful — many spot-ons aren't licensed below 8 weeks or a minimum weight, and some active ingredients aren't safe for very young pups at all. What has your vet said about the puppy so far, and has she had any treatments yet?

Understood — a clean slate, which actually makes it easier to set up properly. For your two adult Labs I'd go with Frontline Plus spot-on, specifically the large dog size covering 20–40kg — it covers both your adults and uses fipronil plus S-methoprene, which kills adult fleas and also targets flea eggs and larvae, so it does more than just knock down the adults you can see. Apply both on the same day so their cycles stay aligned. For the puppy at 9 weeks and 4kg, Frontline also makes a formulation for puppies from 2kg — but at her age I'd genuinely recommend a quick vet call before you apply anything, just to confirm she's fit and well and that weight is accurate. It's a five-minute conversation and worth it. Now, the house: you need a home flea spray alongside all of this. Indorex Defence Household Flea Spray is the one I'd point you to — it contains permethrin for the adults and an insect growth regulator to stop eggs developing. Treat every room, under furniture, along skirting boards. One can covers 150 square metres and the IGR keeps working for up to 12 months. Do the house the same day you treat the adults.

The simplest method: treat all three on the same calendar date each month and put a recurring reminder in your phone. Frontline Plus is a monthly treatment, so pick a date — the 1st works well for most people — and do all three at once. Once the puppy's weight increases and your vet confirms it's fine to stay on Frontline Plus, she'll slot into exactly the same routine as the adults. Keep a note of each dog's current weight every few months too — Labs grow fast, and you want to make sure you're using the right weight band. The home spray is a one-off unless you spot signs of reinfestation, but the monthly pet treatments are your ongoing defence.

You're all set. To recap: Frontline Plus large dog for both adults, same day application, monthly on a fixed date. Quick vet check before treating the puppy, then she joins the same schedule. Indorex for the house today, covering every room thoroughly. Do all of that this week and you'll break the cycle quickly. Good luck with the new addition to the pack.