I think it's 37-38" tall. NO ONE has jumped it..from the fattest to the fittest. The 8 month old can squeeze through the bars, as can a couple of the thinner adult residents, but they have to really try. The 14# polydactyl cant; get through.Thanks for the encouragement! If they had a really, really tall one it might work, but we have our kitchen and dining area gated with the swing doors to keep our dogs contained when we're not home. Our cats jump over the gates like they aren't even there!