
Breeders that have followed a regular worming regime for generations over 40 years tell me that they find mcuh less worm burden in pups these days. this must be due to a cumulative affect. Well wormed pups have less worm larva encyst in their tissues to pass on to their pups and so on down the generations.
So it is quite shocking to see an obviously wormy pup. A heavy worm burden can stunt growth, cause internal damage and even death, and unfortunately getting rid of them can cause problems with toxicity. This is even more of a problem in the states when rescues treat heart worm, as the dead worms can cause blockages, and the poor dog has to be kept very quiet, usually caged throughout the treatment.