A parasite lives off of another organism. When your dog has worms, some live off the food your dog eats. Others like hookworms and whipworms live off blood. And some parasites can cause diseases. Hookworms can cause anemia and roundworms can lead to poor growth and development. Most worms aren’t visible to the naked eye in your dog’s stool. So if you suspect your dog has worms, you need to have a fecal test done. Your vet will need a stool sample to examine under a microscope for eggs. If your dog has worms, you should put him on a parasite cleanse for a minimum of 2 weeks. You’ll need to watch his poop as you’ll be able to see when the worms are leaving his body. You’ll also note that his symptoms start to improve. Avoid Chemical Dewormers: Some veterinarians recommend deworming your dog 2 to 4 times a year with toxic drugs. That’s their version of a “cleanse.” But deworming drugs are harsh and will suppress your dog’s immune system. Instead, support your dog’s immune system by putting him on a parasite cleanse several times throughout the year. Healthy dogs aren’t attractive hosts for parasites and worms. You can feed your dog anti-parasitic herbs and antioxidant-rich foods as described below. These will continue to strengthen your dog’s immunity to expel future invaders.