I worm everyone quarterly... only because it's MUCH easier to worm the animals than it is to worm the humans
I also slack off the flea & tick meds in the cold winter months...
It should be said they've made it so it's easy for everyone really.. if you have the time & energy to learn about...
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IN GENERAL.. dogs are only de-wormed when worms are FOUND in their stool.
Now the OP mentioned a HUGE price, which is always the Tapeworm meds, which also in general are not available to the general public.. so here tapeworm meds wouldn't have done a thing for round worms, I hope that...
http://www.PetShed.com PetShed is in Australia, however, they have a product called Canex.. it's a good de-wormer and includes Hook, Round, Whip & Tape. This sort of thing isn't offered here in the states because we couldn't possibly be "trusted" worming our dogs ourselves with vet...