i started to give my pregnant bitch panacur yesterday day 42 ... the vet said it was safe is he right ? i know this thread is a couple of weeks old but just found it in search

your dog is possible to have worms but you CAN'T see any signs until he is very very infected and he starts to loose weight. even if dog has worms is not necessarily that they will be in his poo. when the dog is full of worms you can see them if he throws up. If you don't deworm him properly,worm eggs can come in his blood.
well, our vets here say that we should deworm/and prevent dogs every three months, and we get deworming tablets for free here in Slovenia.
my doglett gets his deworming treatment every three monts.