One option for the pet owners to diagnose the grades in dogs is canine poop. The poop of the Giardiasis suffers dogs will look fatty, often with greenish ting, smelly poo, and can range from soft to watery. In severe cases, blood and mucus can also be observed in the poop. Other symptoms include severe diarrhea, vomiting, weight loss, dehydration, and a dry, ugly coat.