Is it okay to not treat parasite in dogs?

No, it's not. Parasite infestation can lead to a multitude of diseases like:

* Pruritus * Flea Allergy Dermatitis (FAD) * Tapeworm (Dipylidium caninum) * Anemia * Lyme disease * Human granulocytic and monocytic ehrlichiosis * Babesiosis * Relapsing fever * Rocky Mountain spotted fever * Colorado tick fever * Tularemia * Q fever * Tick paralysis If you really care for your pet, take the time to rid it of parasites and avoid these diseases. If you don't, do it for your own sake. Remember, most parasites do not care to which breed their host belongs -- they can be canine or human. I suggest you consult your vet before you need to consult a physician.