Your local vet will know what the local fleas are immune to they’re flogging at the moment, so check with them first.
quite happy to trust my vet’s specialist treatment but don’t want to buy routine treatment from them.
my dog had terrible fleas, as did our house. GF of the time, who was in charge of such things, claimed it wasn’t possible to resolve the problem. got rid of the GF, bought frontline equivalent ( same active ingredient ) online, and also bought idiran spray for the vacuum cleaner and house.
rained down toxic death on the house, hoovered regularly with the treated vacuum cleaner ( so it didn’t just spray the eggs back out the exhaust ), washed bedding and applied toxic death, treated the dog once a month for a few months.
problem solved. just keep an eye on her now for increased scratching, then brush her, wash and treat bedding, and treat her with the same frontline copy stuff. only had a couple of fleas on her in a few years now, and it’s so far been pretty easy to get back on top of.
i don’t like the idea of applying pesticides to my dog routinely, or spending more than i need, so just when necessary seems reasonable.