Deworming collars are an uncommon means of deworming because there is no control over the amount of medication given, specifically there is still some deworming effect, but the risk is greater, especially since some deworming collars use highly toxic deworming medications. In vitro deworming of dogs is usually done with skin drops, which are mainly composed of Seramycin and other drugs with minimal toxic side effects and are simple to use, and can be applied directly to the neck of the dog.
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