Just wormed my three Chessies with Drontal Plus XL and i was wondering if they have worked. Been checking their poo and it has no sign of the TW that they had. How do i know if they are clear?
You don't. Unless they have a massive burden of ascarid worms (common in puppies) then the worms can be digested in the faeces so you may never see anything come out the back end.
You can have faecal egg counts done if you are really worried about it.
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