Only 70% of all cats react to it, as far as I know.

This is what I found on www.drsfostersmith.com:

"The catnip reaction is inherited in an autosomal dominant gene. Up to a third of adult cats, in which the gene is not present, are totally unaffected by catnip. Kittens under 3 months of age do not usually react to catnip, either."


Well, personally it surprises me that they say "kittens under 3 months of age", this is new to me; I thought it was 6 months...

Kirsten