
I worm all mine with milbermax and never have any Mr Whippy poo's. Should work within 24 hours if they are wormy.
Do you free feed them? if so you should make sure he is not eating far too much. I am not a believer in free feeding and I like to see every pup have it's share. If you feed 4-5 times a day you can monitor it better.
Aileen