ive always used drontal before now and this time im useing panacur mum still has a week to go, i will carry on with panacur for pups and mum ,but if your going to use drontal now you need to use same on mum ,what i did was worm pups then worm mum day after the pups has they only need 1 dose every 2 weeks ,the reason i did mum day after was the wormer for mum still goes though mums milk so the pups are getting more then just theirs, so the pups arnt getting a massive amount in 1 go as it can knock then off their tiny paws.