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Tea Tree Oil
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EC: WARNING! Tea Tree oil may be toxic to cats and dogs!
From Wikipedia:
Pet Flea Control use
Tea tree oil has long been used as a method of all natural effective flea control by adding the oil directly to dogs, horses and sheep fur or their bathing water. Use on cats has been known to make them sick and in some cases kill them, this is due to cats licking their fur and consuming the oil.[23]
According to National Animal Poison Control Center, the use of tea tree oil in dogs has been associated with hypothermia, muscle weakness, ataxia, tremors, altered behavior, paralysis. A case report has been published in which three cats had clinical signs and one cat died after being treated with the oil. [24]
Also read this feedback on Earth Clinic: https://www.earthclinic.com/remedies/tea_tree_oil.html#TOXICCATSDOGS
