FOUND DRONTAL TO BEST WORMER FOR LITTER OF PUPS. YOU CAN BUY DRONTAL PUPPY LIQUID STUFF. BUT I FOUND IT VERY MESSY AND HARD TO GET DOWN PUPS SO CHANGED OVER TO DRONTAL TABLETS AND JUST BROKE THEM INTO THE REQUIRED SIZE ACCORDING TO WEIGHT OF INDIVIDUAL PUP. I WORM MY PUPS AT WEEKS 2,4,6,8 AND 12 THEN EVERY 3 MONTHS AFTER THAT DATE. THE BITCH SHOULD BE WORMED AT SAME TIME AS THE PUPS AS SEE WILL CARRY AND CAN PASS WORMS TO THE PUPS.