Flea treatment for 3 dogs different sizes

Three dogs of different sizes — that means three different dose strengths, which catches a lot of people out. And here's the thing most people miss: 95% of fleas aren't on your dogs at all, they're in your carpets, sofas, and bedding, so treating the dogs alone won't solve this. You really need the right dose for each dog plus a proper home spray to break the cycle. Can you tell me the breeds and weights of your three dogs, how bad the infestation looks right now, and whether you've already done anything to treat the house?

That's a really common situation and completely manageable — you've caught it before it gets truly out of hand. For your three dogs, Frontline Spot On is the one to go with. It covers ticks too, which is a bonus. You'll need the S pipettes (2–10kg) for your Chihuahua, the M pipettes (10–20kg) for your Cocker Spaniel, and the L pipettes (20–40kg) for your Labrador. They're all sold separately by size on Amazon UK, so just search 'Frontline Spot On S', 'M', and 'L' — three packs, one for each dog. Apply to the back of the neck where they can't lick it. For the house, get Indorex Defence Household Flea Spray — one 500ml can treats up to 100 square metres and kills flea eggs and larvae for up to 12 months. Vacuum everywhere first, then spray all carpets, skirting boards, and soft furnishings. That combination — all three dogs treated on the same day plus the house done — is what actually breaks the cycle.

Same day, definitely. If you do them separately, the untreated dogs keep picking up fleas from the environment and spreading them back around. Treat all three together, spray the house the same day or within 24 hours, and you've cut off the cycle at both ends. It feels like a lot to do at once, but it's genuinely the only way to get ahead of it quickly.

Frontline Spot On is one of the most widely used treatments for small dogs precisely because it has a good safety record at that size. The S pipette is specifically dosed for dogs between 2 and 10kg, so at 3kg your Chihuahua is well within range. The key is using the correct size pipette — never split a larger pipette to save money, that's where problems happen. Apply it to the skin at the back of the neck, part the fur so it contacts the skin directly, and keep her away from the other dogs for a few hours until it's dry.

You've got a solid plan. One last tip: mark the date on your calendar and retreat all three dogs in four weeks — Frontline lasts about a month, and that second treatment catches any eggs that hatched after the first round. After that you're into normal monthly maintenance and it stays manageable. Good luck with all three of them.