Roundworm

• Roundworm live in the cat's intestine, passing eggs through the feces, and can cause intestinal blockage if not treated.
  
  

Tapeworm

• Tapeworms occupy the small intestine, its head buried, and cause the cat to not gain the proper nutrients from the food it eats.
  
  

Hookworm

• Hookworms enter the feline body as larvae, which then travel to the lungs, then the intestine, where they develop into adult hookworms, causing diarrhea, black stool, anemia through blood loss and eventually death, if left untreated.
  
  

Giardia

• Giardia affects the small intestine of the feline, causing acute diarrhea within one to two weeks of infestation.
  
  

Coccidiosis

• Coccidia are microscopic parasites that cause diarrhea in cats and kittens, as they attack the intestinal lining.