192 DISEASES OF 



when devouring the head of the sheep, and the contin- 

 uation of the development produces the tenia cenurus 

 or dog tape-worm. As the worm developes, the eggs are 

 voided by the dog. They are voided in great num- 

 bers and are distributed on the grass over which the 

 dog has passed. The sheep eat them with the grass, 

 and in this way the parasite gains access to the internal 

 organs. 



Symptoms. In from 8 to 20 days after the parasite 

 has reached the brain, signs of congestion appear ; the 

 head is carried lower or higher than usual and to one 

 side ; the animal performs forward movements to the 

 right or left, in a circle, or it rotates in one spot going 

 round as if on a pivot. In some cases the animal acts 

 as if intoxicated, and frequently stumbles and falls. 

 It will keep by itself and shun other sheep. In some 

 cases it goes straight forward, lifting the head and 

 feet higher than usual. The symptoms will vary accord- 

 ing to the situation in the brain that the parasite oc- 

 cupies; we may have partial or complete paralysis. 



Treatment We shall not recommend any treatment 

 for cases in which gid has already developed, but must 

 be content to advise that the heads of sheep that have 

 died from it should be burnt ; and in fact the heads of 

 sheep should never be fed to dogs. If this rule was 

 carefully observed, the species of cenurus cerebralis 

 would soon become extinct. 



