I’m not to sure on how you can stop/treat this but I hope your dogs are ok. The only thing I can suggest after everything you have already tried is, after a big soapy bath, use a flea comb and then put on a spray. I think that combination could definitely make the situation better. I’m assuming you have more than one dog because you said dogs? If that’s the case I think you should have a separate comb for each one so as not to spread fleas and also bath separately if not already. (Also clean the bath after bathing one and then bath the other) if you are still dealing with the fleas perhaps take them to the vet and make sure it is fleas your dealing with. If you manage to rid one of fleas make sure to keep it away from the other dog/s that have fleas so it doesn’t pick them up again. You may already do this stuff and so sorry because then this advice is useless. I hope you manage to get rid of them safely and that your dogs are ok.
Hope this helps 🙂 sorry if it doesn’t 🙁
Thanks