Now if they were treated yet we are seeing treatment failure (since there are fleas on them), then we do have to consider re-treating with an alternative product to tackle these. Now if it has been a bit more then a week, I would warn that we usually cannot re-treat until at least 2 weeks have passed. Therefore, you may need to delay treating again for a few more days. That said, when you do so, consider using an alternative treatment (since it sounds like this product has resistance issues). Options you could use are the spot-on treatments Advantage Multi (this is different from Advantage and also does worms), Vectra 3-D, Activyl, Revolution, or Stronghold. Otherwise, you can choose to use an oral treatment like Trifexis, Capstar, or Comfortis. These should be available at your vets and can be dispensed as long as they have recent weights for the dogs. And this would ensure they are protected from the fleas themselves.
Further to this, since a lot of itching from fleas isn't due to the flea itself but instead the allergic reaction caused by their saliva when they bite, I would note that your wee ones may benefit from a short course of antihistamines. Most commonly we use Benadryl/Diphenhydramine for these cases (More Info/Dose @ http://www.petplace.com/drug-library/diphenhydramine-benadryl/page1.aspx). A low dose (ie. 0.5mg per pound of body weight twice daily) can just be enough to reduce that allergic irritation for them. We like to keep the dose low in dogs, as they can have drowsiness with this medication (just like people). And of course, this medication shouldn't be used if any of them have any pre-existing conditions or is on any other medication without speaking to your vet. But this could just reduce the irritation as you tackle the fleas.
Finally, since fleas are a parasite that can leave their host to wander our homes and lay their eggs
in soft furnishings, we need to treat the house as well. Now there are not a lot of reliable natural products but you can overcome a flea outbreak with some diligent work at home. To do so, you can washing all soft furnishings (on warm in your washer) to kill eggs and larva. You can also help reduce the population by vacuuming. Now when doing this, you need to do it often since the initial vacuuming will stimulate flea eggs to hatch. As well, you need to reach all those places that flea mums will have laid eggs (so carpet in closets or under the couches need to be targeted as well. So, after the stimuli, we'd vacuum every few days to suck up as many of those present in the carpet as possible. Furthermore, you can use Diatomaceous Earth on the carpet against the fleas before vacuuming. This takes dedication but would get around chemical treatments. Otherwise, if you did use a chemical treatment, I would just note to ensure it contains Insect Growth
Regulator (IGR), since that will prevent the eggs from hatching and larvae from developing. So, where most house flea products just kill adults, the IGR containing ones will target all life stages.
So, this would be our above approach here to tackle the fleas on the dogs, in the house, and try to soothe their skin to reduce that itch for them.
I hope this information is helpful.
If you need any additional information, do not hesitate to ask!
All the best,
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