Be very careful when you use ovc.The best thing to do is take a fecal sample to your vets so in case there are other types(hookworm,whipworm) you need to treat the puppy/dog for. Hair coat can also indicate worms .If the texture of one of my dogs coats changes,usually becomes too hard or dry,I know somebody has something,it has been hookworms in the past..Hookworms are contracted by eating feaces or dirt containg the eggs which can live in soil for well over a year.Clean up is especially important.To prevent a re-infestation keeping the animal on a monthly heartworm preventive (Heartguard or Iterceptor) will help. Heartworm is different than intestinal parasites and can only be found with a blood test,once the test is done then put the dog on the heartworm preventative.