Good ,Wolfie I am glad that you find a regime that works for you and you are prepared to take the associated risks.
I worm count my dogs 3 monthly and comb with a nit comb and lint roll
daily. (Yep even the newfie!) No chemicals needed but super high protection from fleas, ticks and worms. No impact on the environment, wildlife or even me and the dogs can cuddle up to the DC safely.