TeaTree Essential Oil is Toxic for both humans and pets if taken orally. Therefore you must NEVER give Tea Tree oil to your cat or dog orally.
You must always consult with your vet before using Essential Oils on pets.
Due to Tea Tree oil’s popularity as a natural and effective Essential oil in treating skin conditions in humans, there are a few veterinary skin care products that contain small amounts of tea tree oil. In small concentrations (.1% to 1%), tea tree oil is tolerated and safe for cats and dogs when used in products for pets (such as to control external parasites for examples). However you must be extremely careful (especially for cats that have the tendency to lick their skin).
Tea Tree Oil for Dogs
Because dogs are bigger animals than cats, using Tea Tree oil for various use cases is safer if done properly compared to cats.You must dilute the oil before using on your pet however.
Some people put a few diluted drops of TeaTree oil on their dog’s collar and a few drops in the pets’ crates and beds to keep the fleas away. Our blend of pure TeaTree + Lavender Essential oil has been successfully used by many customers on dogs for repelling fleas with great results (always dilute in water or other carrier oil).
Tea Tree Oil for Cats
Other than some natural Pet products that contain small concentrations of TeaTree (.1% to 1%), I wouldn’t suggest you to use Tea Tree Essential oil on cats. There are numerous reports about lethal toxicity of TeaTree oil when used on cats, so I wouldn’t use it on kittens.