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New puppy has fleas. Can my recently treated dog catch them again?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | unneutered | 1 month and 22 days old

Treated my adult dog for fleas last week got new puppy today and realised he has fleas just treated him now but just wondering could my adult dog still get the fleece even do he was only treated last week

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on January 30th, 2021

Great question! Your adult dog should be protected, but the house will be infested and he can get the fleas when the flea treatment wears off. I can give you a flea treatment for Brody, since he is almost 8 weeks of age. First, I would give him Capstar. It's a one time pill that starts killing fleas within 30. minutes. Then follow up with a spot on treatment, such as Advantage or Revolution. This is a treatment that has to be used once a month. You will also have to disinfect the environment. Wash his bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. I hope this helps!

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