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Hookworm stages

A. canium eggs A. canium eggs  
Morulated hookworm eggs are passed in the feces of infected dogs and cats; the most commonly seen species are A. caninum in the dog and A. tubaeforme in the cat.  
Buccal cavity Anclystoma in dog alimentary tract Lesions in puppy small intestine

Adult hookworms in the small intestine of infected dogs or cats are attached to the intestinal villi by a large mouth cavity (buccal cavity).
Male copulatory bursa grasping female Males and females in copula  
Male hookworms have a posterior copulatory, and it is not uncommon to observe worms in copula in the small intestine.  
Hooked heads and copulatory bursa  
The heads of both males and females are bent dorsally, giving them a “fishing hook” appearance. Ancylostoma tubaeforme and A. caninum have three pairs of teeth in the buccal cavity A. canium teeth Uncinaria cutting plates
  Ancylostoma braziliense has one pair of teeth, and U. stenocephala has only cutting plates
Ancylosoma adults Uncinaria egg 80 x 40 um  

Dog and cat hookworms range in size from 10 to 20 mm by 0.4 to 0.5 mm.

Eggs range in size from 55 to 90 µm by 30 to 55 µm, depending on the species. Ancylostoma spp. eggs are 55 to 75 µm by 34 to 47 µm; U. stenocephala eggs are 71 to 93 µm by 35 to 58 µm.

  

   
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