How do I worm a Horsfield Tort and where do I get the wormig stuff from? How often do they need worming?

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I'm not biased, I don't care who beats St Helens

worming is very complicated.there are many types of parasites, all of them require different treatment. you need to get a poo sample to the vet and ask them to check for parasites. IF he has any, the vet will treat them for you, and if you ask, show you how to do it in the future. if you dont have any experience in this type of thing then i really wouldnt suggest trying to self medicate a tortoise. and no one treatment is fully comprehensive against parasites.

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The goat made me remember!! all hail the mighty goat

How is a tort usually wormed then?

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I'm not biased, I don't care who beats St Helens