Intestinal Parasites, also known as worms, are very common health issue and dogs can get it in bunch of ways. These parasites can cause even mild to severe issues and can lead to life threatening complications if it not get cured. Here's some ways your dog can get intestinal parasites:

Common ways of dogs getting intestinal parasites:
1-Eating contaminated Poop: Dogs sniffs and eats another dogs or animals, it's very common way to get worms like roundworms and hookworms in puppies.
2-Contaminated soil: Dogs can consumes parasite eggs or larvae by contaminated soil, it often founds, where other infected animals have discharged feces from the bowels.
3-Mother to puppy Transmission: Some parasites can be passes through mother to her puppies. this can probably through the placenta before the birth.
4-Prey Animals: Infected tissues may be consumed by dogs who hunts and gather wildlife, small animals such as rates and rabbits can act as intermediate hosts for certain parasites.
5-Poor hygiene or cramped living conditions: Poor sanitation can serve as breeding grounds for parasites transmission due to close contact between animal and shared supplies.

Types of Intestinal parasites in Dogs:

• Hookworms: these are small in size, and sucks blood which can cause anemia in dogs.
• Tapeworms: They are long, flat parasites, and causes digestion related problems and weight loss in dogs.
• Whipworms: They are whip-shaped and small parasites, that causes diarrhea.
• Roundworms: they are also long and thin parasites, causes digestive issues.

How to prevent Intestinal Parasites in Dogs: 

• Regular deworming
• clean environment 
• Consistent Veterinary tests
• Maintaining good Hygiene

Conclusion: Intestinal parasites are so common issues in dogs, by maintaining good hygiene, keeping the living environment clean and providing deworming medicines can help you dogs to not get intestinal parasites.