Getting them from their mother
If a dog is pregnant, you should check first if she’s infected, because it’s known that hookworms and roundworms can be transmitted to the puppy during pregnancy or through lactation. It’s very serious for a puppy to have intestinal worms, that’s why a worming treatment is a must.
Swallowing fleas while grooming
In the process of grooming, your dog may get infected by the fleas that live in their fur. Fleas can carry worm’s eggs or larvae, which can be developed into adult in the dog’s intestine. In order to prevent that from happening, you should keep up with your dog’s flea prevention program.