How long after a dog’s topical deworming can it not be bathed?
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Expert Answer
A dog should not be bathed within one week after topical deworming. The drug takes a long time to absorb and spread through the body, generally about 3 days, so it is best to wait a full week before bathing to protect the effect.
Bathing too soon after deworming causes the drug to wash off and lowers its effect, leading to failed parasite control.