I recommend getting a soothing balm when taming it on berries it only goes up like three % even on mejoberrys so I got a soothing balm and fed it to him and now it goes up like 35% each time I feed him my dippy name is mango I almost tame a therizinosaurus with him but I ran out of biotoxin and it killed me

More Diplodocus Taming & KO Tips