Roundworms may be free-living or parasitic, and roundworms Nearly all puppies and kittens have roundworms. Given these facts, what might puppies and kitties have among the following options:
- They have thick fur
 - leeches
 - Animal fur
 - fur and fat
 - sensory neurons
 - parasitic snakes
 - crickets
 - parasitic worms


 

        parasitic worms 