Cat among pigeons time

. I don't use any form of flea preventative/treatment on a regular basis, preferring not to use anything like that on my dogs unless necessary. I have Practic (bought from the vet) in the house but would only use it if I found a flea, or evidence of fleas, on the dogs, or if I knew they'd been in contact with a dog that already had a flea problem
William is mainly white so fleas are easy to see on him. It's more difficult with blue roan and tan Louis, but I have a good look every time I groom them as I'm always checking them for ticks (we walk in the New Forest and there are loads of ticks there). I think the last time I saw a flea on one of the dogs was a couple of years ago.
I'm not saying that I'm right, it's just my preference. I also keep a big can of the spray you use in the house if you get a flea infestation, just in case it's needed.