166 WORMS INFESTING THE DOG. 



this is done it may readily be supposed that a Cysticercus or 

 Ccenurus has been left behind, and when the cooked food is 

 replaced, mixes with it, and is thus admitted into the stomach of 

 the dog. In this way only can I explain the occurrence of tape- 

 worm in kennelled dogs carefully fed on cooked food, and well 

 looked after when at exercise ; though, of course, with every 

 precaution it will happen sometimes that dogs get to offal or some 

 kind of raw food out of doors, and in that way upset all pre- 

 cautions at home. But the most fertile source of tape-worm is no 

 doubt the intestines and liver of the hare, which are so commonly 

 given to the young greyhound to encourage him to kill savagely, 

 or which he himself will often tear out when he has been 

 allowed to do so. As these contain the Cysticercus pisifoi'mis, 

 which becomes developed into Tcenia serrata, it needs no other 

 explanation of one mode of introduction of tape-worm. As the 

 origin of the Tcenia cucumerina has not been ascertained, 

 precautions cannot be taken against its special source, but by 

 avoiding all kinds of raw food no doubt it may be altogether 

 prevented. 



There is more difficulty in preventing the development of round- 

 worms, because, though it is easy enough to boil all the water 

 which is used in the kennel, it is almost impossible to keep dogs 

 from drinking when out at exercise, and it is in ponds and 

 stagnant water that the eggs of the round-worm, and most 

 probably of the maw-worm, are stored up, ready for bursting their 

 shells when they are swallowed by the dog. Clearly, however, the 

 water used in kennel should always be boiled, and greyhounds 



