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Hello, Thanks for writing in. My name is***** and I would be happy to help you. Hopefully after the 2nd dip, they shouldn't be contagious anymore, but I would still talk to your friend about taking a precaution. There is nothing else you can do on your end to prevent lice infestation to the other dogs. If they are on Frontline monthly (labeled for lice), then that should prevent it. Your friend can also get insecticide flea and tick collars and use them on her dogs to help prevent infestation. Most are not labeled for lice but usually work well for them. Please let me know if you have any other questions or concerns. Hope this helps.
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