i dont think you should get a cat or ferret harness..
i had this problem.., pebbles was 1 pound and couldnt fit into anything.. anyway.. on
www.funnyfur.com they have some small harnesses made of really soft material and they come in a size "teacup" for dogs 1-2 pounds. it fits her really well, perfectly, even!!
http://www.funnyfur.com/index.asp?Pa...ROD&ProdID=470
that is the one i got, along with the matching yellow microfiber lead... i figure when im done with it someone on here will be more than willing to buy it off me. ive had it for 2 months now and it still fits her with a lot of velcro space left to adjust