I would use another wormer because she is pregnant and she needs something that takes care of tapes. Ivomec is for horses and we beaglers have adopted it for our hounds. Alot of us use different dosages. How much would be to much for the pups to be ?
I've always given 1/10 cc per 10 lbs until 2009 when I started giving 3/10 cc to 25 lb dogs twice a month. Haven't bred anything in that time but my vet said it should be fine. He also tells me not to worm for tapes unless I see them in the stool and only worm the ones I see have tapes.