Here is a few ideas to keep them at bay from areas you don't want them: Eucalyptus and Lemon may be the very essence of freshness to humans, but to animals, especially cats, it's off-putting. ... Because of their superior smelling abilities, they are sensitive to citrus-based products and Eucalyptus oil.

Is the smell of eucalyptus bad for cats?

Cats are especially sensitive to many essential oils and even just a couple of licks can be harmful. Many essential oils, such as eucalyptus oil, tea tree oil, cinnamon, citrus, pennyroyal, peppermint, pine, sweet birch, wintergreen, and ylang ylang are toxic to pets.

Is eucalyptus air freshener safe for cats?

Essential oils that are known to cause poisoning in cats include oil of wintergreen, oil of sweet birch, citrus oil (d-limonene), pine oils, Ylang Ylang oil, peppermint oil, cinnamon oil, pennyroyal oil, clove oil, eucalyptus oil, and tea tree oil.