PARASITES AND PARASITIC DISEASES OP DOGS 



21 



and the worm attaches with this armed mouth to the Hning of the 

 small intestine and sucks blood. Another dog hookworm, the narrow- 

 headed hookworm, Uncinaria stenocepJiala, is not uncommon in dogs 



m:>& 



VMS?!. ■-a5^"««sS;:a??^;S>V'; 



Figure 17.— A portion of the 

 small mtestine of a dog; slit 

 open to show 6 attached 

 hookworms. Natural size. 

 Adapted from Fieblger, 1923. 



Figure 18.— The common dog hookworm, 

 AricyUtstoma eaninum. Head. Dorsal 

 view. Enlarged. From Eiley and Fitch, 

 1912, after Looss. 



in Europe and in foxes in the United States and Canada, but appears 

 to be very rare in the dog in this country. This is a smaller worm, 

 the male being one-fifth to one-third inch (5 to 8 millimeters) long, 



FlQUBE 19.- 



-The narrow-headed dog hookworm, Uncinaria stenocephaia. Head. Left, dorsal view; 

 right, lateral view. Enlarged. From Eiley and Fitch, after Looss. 



and the female one- third to almost one-half inch (8 to 11 mUlimeters) 

 long. The mouth is armed with cutting plates (fig. 19), but is 

 without the six teeth which are present in the common dog hook- 

 worm. It is, however, a blood sucker like the other. 



