Drontal plus xl worming tablets you can worm a 35 kg dog with just one tablet unfortunately there is no tablet or injection you can give a dog which will prevent aworm infection the best you can do is to kill any worms which may be present on a regular basis to avoid worms reaching maturity and affecting your pets health you should worm your pet regularly this will also reduce public health risks worming every three months will reduce this risk but ask your vet who will be able to e