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If unsure about parasite prevention, this is the first step. Use a broad spectrum, effective product such as Advocate on both dogs and ensure the environment is deep cleaned.
Unfortunately, Frenchies are very prone to skin allergies so this needs to be considered. They can react to anything e.g. food, pollen, dust mites, grass etc. If very itchy, an anti itch medicine from the vet is likely a sensible idea. If the skin is broken, many also require antibiotics and a medicated wash.
If never done, the vet may consider some basic tests such as a skin swab and scrape.
I hope this helps and please let me know if you have any further questions.