Originally Posted by ownedbycats
honestly, as long as it doesn't cause an allergic reaction, I see no harm. It's not like you have to sedate them, or stick them with real needles.
I think the six months was for cats with fur: it lasts until the fur falls out. On a sphinx, with little fur, its effects should be more like on human skin I would think.
thx for that input rr and OBC - How long does henna last on human skin - days?