The males and females mate, and the female produces eggs that are passed in the feces. The next host is infected when an infective larva penetrates the host's skin, are ingested in the larval form, or in the case of a puppy are passed through the mother's placenta or milk. The juvenile worm migrates through the host's body and finally They attach to the animal's small intestine where it grows to sexual maturity. Hookworms are blood feeders and the mouthparts of hookworms have teeth. Attachment causes hemorrhages and leave bleeding sores.
Hookworm disease can have devastating effects due to the loss of excessive amounts of blood.
Hookworms may cause anemia and black feces in your pet. A severe hookworm infestation can cause enough damage to kill puppies, but chronic hookworm infection is usually not a problem in the older dog. There are two common types of Tapeworm in pets. One type, Dipylidium caninum is spread when the perianal region of the dog becomes contaminated with eggs when eggs are passed in the feces, and the flea ingests the eggs. The dog is infected when they ingest an infected flea.