There is no accurate answer to this, because the current external anthelmintic drugs can only kill adult worms, but not eggs. Therefore, although the body surface of some cats temporarily seems to be free of parasites, it will take a while. It appears again, because their eggs have developed into adult worms, so we need to perform external deworming regularly.

Tip:

When the weather is hot, there will be more external parasites. At this time, we should increase the frequency of external deworming. If your cat does not go out often, that is okay. Appropriately reduce the frequency of deworming.