Some dogs don't show clinical signs of worm infestation. (vetinfo.com)
If your vet finds signs of worms in puppy poop, appropriate measures should also be taken to reduce the possibility of transmission to a house mate or family member. (dog-health-guide.org)
Some of the common signs of worm infections are listed below, but these may also be symptoms of other illnesses. (all-about-puppies.com)