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WARNING!
Just a reminder that felines are radically different, physiologically, from both dogs and rabbits. Cats are able to absorb many things through their skin, including oils and other solutions, and even many essential oils can be harmful to them, whether by inhalation, ingestion, or absorption. Just because Campho Phenique works on a dog or rabbit does NOT mean it is safe for use with a cat ;o) Their livers are unable to process these things in the same way other species can, and it can quickly toxify their system. I am using warm water with a few drops of witch hazel, and a drop of gentle pet shampoo to cleanse my cat's ears. I gently wipe out, then use slightly warm olive oil to soothe.
Campho Phenique
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Campho Phenique is toxic to cats, though I have used it successfully with rabbits. Cats do not have the necessary enzyme to break down any type of Phenol, so it builds up in the liver. Phenols, also contained in many household cleaning products, are also toxic to dogs. We used room temperature Colloidal Silver (I think 5ppm) to eliminate ear mites in our cats (half the dropper, every 24 hrs for 7 days). It didn't kill the eggs though, and the mites appear to have hatched, so must be dealt with again. Perhaps we should have continued treatment for the gestation period of the mite eggs?