Worms can get into your dog's system in a number of ways as your dog explores the world around it nose-first! For example, if you or your dog comes into contact with stool infected with worms, the resilient eggs may have survived and find a way to get to your dog, whether that be on the sole of your shoe or on your pet's coat. As soon as these eggs come anywhere near your dog's mouth, they can cause a worm infestation and, unfortunately, dogs are popular host animals for a number of different worm species. This is why regularly worming your dog is not just highly recommended, but an essential part of dog-owning.