346 



THE DOG IN DISEASE. 



Practically we have to do with neinatode, or round 

 worms, and cestode^ or tape-worms. 



Fig. 29.— Eustronoylus Gigas (Cobbold). 

 This parasite is occasionally found of great size in the dog, especially in the kidney. 



The principal round worm of the dog is Ascaris mar- 

 ginata^ pale-red in color, round, tapering to each end, 

 firm to the feel, the sexes distinct, propagated by eggs 

 {ova) with great resisting power, and capable of maintain- 

 ing their vitality for months, from one to eight inches in 



Fig, 30.— Ascaridks (Stonehenge). 



length, living in the small intestine, and moving about 

 freely — i. e., not attached. Ascaris mystax also occurs. 



The thread-worm, or oxyaris, is very small, similar in 

 formation and mode of propagation to the preceding, lives 



