Hydatid disease is caused by the infection of the dog tapeworm echinococcus granulosus in its larva stage. This happens as a result of accidental ingestion of the excreted tapeworm eggs in the facets of dogs that are infected. The tapeworm echinococcus granulosus is about 5 mm in size and it grows in the gut of animals like dogs, foxes etc. Eggs of these worms are excreted with the stool and cause infection in intermediate hosts like sheep, goats, camels, pigs etc. These eggs are hatched while they are inside the body of the intermediate host and they invade the intestinal walls and are carried to important organs like liver, lungs, brain etc. causing the formation of hydatid cysts in these animals. These herbivores when eaten by carnivores, new tapeworm develops in about six week’s time in them and the cycle repeats. Humans get infected by handling the infected dogs and mostly the infection occurs in children. The infection results in the formation of cysts and they remain unnoticed for several years. The incubation period for the discovery of the symptoms of hydatid disease can be up to fifty years and during this period the disease remains unnoticed. If the fluid from the cyst comes in contact with the patient’s immune system, it can result in life threatening anaphylaxis.