Dogs and puppies can pass germs, diseases and worms on to people, but it does not occur often. There are certain precautions that you can take to help prevent this from happening. First and foremost, make sure that the dog or puppy you are playing with looks healthy. Do not touch or contact an obviously sick dog. Make sure that your personal dog has regular check ups and is checked for worms by your veterinarian. Look for obvious signs of disease such as spots missing fur on your dog. Hot spots or places that your dog keeps chewing or biting at can be another sign of infection.
One of the best lines of defense from getting sick from contact with a dog is to wash your hands well, especially with anti-bacterial soap. After dog or puppy contact, keep your hands away from your face, especially your mouth. Do not eat finger foods after dog contact until you can wash. Do not let your dog lick you on your face. Try not to have contact with dog saliva, urine or dog feces.
Dogs and puppies can carry a fair variety of bacteria, parasites, fungus and worms. Some of these are fairly common in dogs and others are quite rare. Some people are more likely than others to catch these diseases. Some of the factors associated with catching the diseases depend upon the persons age and status of their health. People who are more likely to get diseases from dogs include infants, children younger than 5 years old, organ transplant patients, people with HIV/AIDS, and people being treated for cancer.