Some cats are really sensitive to chemical means to fight fleas. It can cause different unpleasant side effects so It's better to use natural remedies. Those insects can be scared off with the scent of such plants as peppermint, basil, wormwood, tansy, garlic. Cats don't like the smell of garlic too but it's better than pills. Herbal and citrus sprays are good repellents as well. Here is the article with all the methods of fighting fleas, both chemical and natural. All advantages and side effects are described there.
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