Leah
2 parts tea tree oil and 1 part water mixed in a bowl and sponged all over your pet is supposed to kill fleas. Don't try to drip it all over them, just sponge it on...too much might hurt the animal. I suppose it can't help if the fleas are all in the house unless you get rid of them in the house also, so you should probably try other remedies like Borax laundry detergent. Good luck and God bless!
I just saw a post suggesting tea tree oil for use on animals. This is fine for dogs but tea tree oil is toxic to cats and there have been cases of cats dying after its use. I am a qualified Aromatherapist and understand the chemical content of these oils but most people dont realise the damage they can do to their cats by using them so PLEASE PLEASE do not use tea tree or any other essential oil products on your cat - your cat,s liver cannot cope!