Whether treated with flea powder or liquid, water can wash away chemicals used to treat dogs' fleas or cause them to become ineffective. The period for which the dog must remain dry varies with the product used. For treatment to stay effective, be aware of the recommendations on the labeling and keep your dog dry until the recommended time has passed.
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Flea Collar
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Flea collars should be removed prior to bathing a dog or allowing him to go swimming. Replace the collar after the dog is dry; after a flea bath, wait 24 hours to replace the flea collar to avoid using two flea products together.
Flea Shampoo
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As the name suggests, flea shampoos are intended to be used in conjunction with water; however, the chemical that makes them effective can still be washed away. According to VetInfo.com, shampoos are excellent short-term treatments for flea-infested pets. The effects last only "a day or less," so try to keep your dog dry for about 24 hours.
Flea Powder
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Like flea shampoo, flea powder is a product for quick, short-term use. Flea powder is easily washed off after use, so bathing should be done prior to powder application. As an alternative, reapply flea powder after the bath, waiting 24 hours after the bath if using a flea shampoo.
Flea Spray
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According to VetInfo.com, flea sprays can kill fleas for up to two months; however, it is important to read the packaging for information about individual products. As with other topical flea-control liquids, flea spray must dry completely prior to bathing and drying time may vary; however, like flea powder, it is preferable to bath your dog prior to application.
Topical Flea Treatments
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According to DeadFleas.com, several topical flea treatments, such as Frontline and Advantage, are waterproof for the entire time they remain active and dogs can be bathed after these products have had time to dry. Most of these products require up to 48 hours to dry completely.
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