Flea treatment for Chihuahua puppies

A 10-week-old Chihuahua is about as small as dogs get, so I completely understand the nervousness around dosing — getting it wrong in either direction matters at that size and age. Before I point you to the right product, just a couple of quick things: how much does your puppy weigh roughly, and have you spotted fleas on them directly or are you seeing signs around the house like flea dirt or bites on yourself? Also worth knowing — 95% of fleas actually live in your home rather than on the dog, so whatever we use on the puppy, we'll likely need to tackle the environment too.

That's helpful — 800g is very light, and you're right to be cautious. Most spot-on treatments have a minimum weight of 1kg or 2kg, so she's below the threshold for almost everything in that category. What I'd point you to for the puppy herself is Johnsons 4Fleas Puppy Spray. It's approved from 2 days old, has no minimum weight requirement, and you just apply it lightly to the coat and work it in — no precise dosing by weight needed. It won't give long-term prevention the way a monthly treatment would, but it's the right and safe starting point while she's this tiny. Can I ask — is she the only pet in the house?

It's a fair assumption, but Johnsons 4Fleas Puppy Spray is specifically formulated for young and small animals — it's much gentler than the household environmental sprays, which are a different thing entirely. The key is to avoid spraying near her face; apply it to your hands first and then smooth it around her head area instead. For her bedding, wash it at 60°C if you can — that kills fleas and eggs without any chemicals near her. Once she reaches 1kg and is a bit older, you'll have more options for ongoing monthly prevention, but this gets you moving safely right now.

Yes, and this is important — the flea dirt you found in her bedding tells you there are eggs and larvae in your home already. For the environment I'd suggest Indorex Defence Household Flea Spray. It's one of the most effective household sprays available without a prescription, kills adult fleas on contact and keeps working against larvae and eggs for up to 12 months from a single treatment. The critical thing: keep your puppy and yourself out of treated rooms until the spray has fully dried — usually a couple of hours. Vacuum thoroughly before you spray to stimulate any dormant eggs to hatch, and make sure you get into skirting boards, under furniture and anywhere she sleeps.

Exactly that. Johnsons 4Fleas Puppy Spray on her today, Indorex on the home once she's safely out of the way. Keep an eye on her over the next few weeks, and once she's reliably over 1kg — probably around 12 to 14 weeks — come back and we can look at a proper monthly prevention product suited to her size. You're handling this exactly right by not just grabbing the nearest spot-on off the shelf.