No. 7. DEPARTMENT OF AGRICULTURE. 183 



some trouble in locating the owner, but recognizes the voice as in 

 health. Coaklej has called attention to a symptom he considers 

 pathognomonic, a lixiation of the pupil of the eyes. In dogs confined 

 in well lighted cages, the contracted pupil does not appear to be a 

 constant symptom, and not infrequently one pupil is seen much 

 contracted and the other not at all affected, or even dilated. The 

 eyes do appear to be somewhat limited in their movements, and 

 along with the muscle firmness, there is a glary fixed expression. 

 At this time it may be noticed that the dog is lapping seemingly 

 exerts himself more than usual in attempting to drink water. The 

 water when taken into the mouth mixes with the saliva and the 

 constant movements of the jaw and tongue form a froth. The desire 

 to drink appears to be increased, which is quite natural with the 

 inability to swallow, owing to a gradual and progressive paralysis 

 of the muscles of the pharynx. The paralysis later extends to the 

 jaw and tongue. With the paralysis well advanced, the dog is not 

 capable of swallowing, but the desire and attempt to quench the 

 thirst does not abate. The dog Avill repeatedly plunge his nose into 

 water and make a strenuous attempt to swallow, which at first only 

 causes an increase in the flow of saliva Avith the formation of more 

 froth. The druelling giving rise to the symptoms popularly known 

 as '^frothing at the mouth." Before the paralysis is complete the 

 appetite becomes decidely depraved, which is another characteristic 

 symptom as seen — the destruction and attempt to swallow straw, 

 coal, wood or other foreign material. As paralysis of the pharynx 

 progresses, a significant change in the bark occurs, which is one of 

 the most constant symptoms of rabies in the dog. Occasionally a dog 

 will not bark and nothing will induce him to do so, although he may 

 show all of the other symptoms of the furious stage. The bark in 

 the premonitory stage may be the same as in health, but with the de- 

 velopment of the furious stage, the bark is decidely changed. In- 

 stead of a sharp and clear bark, the latter part of the note becomes 

 prolonged and of a higher pitch. The inability to swallow is due to 

 a progressive jjaralysis of the pharynx. This condition has often 

 been mistaken for symptoms observed when a bone or other foreign 

 body lodges in the throat, and has led many a sympathizer to in- 

 vestigate and thereby expose himself to possible infection. With 

 the progress of the disease, the dog Avill start out and travel tre- 

 mendous distances if unhindered. Wide rivers have been success- 

 fully crossed. There appears to be one desire uppermost within the 

 beast, to go on and on. It is the rule that an attempt will be made 

 to return home or to go to the original starting place. The appear- 

 ance of the animal upon his return is worthy of mention. Emacia- 

 tion is marked ; wounds and blood mixed with foreign matter cover 

 the body; the eyes are clouded and expressionless; the mouth is 

 open owing to paralysis of the lower jaw; the tongue hangs loose 

 and usually discolored ; the mucous membrane is dry and the lips 

 on the sides of both lower and upper jaws lie in close, changing the 

 general appearance of the dog at times beyond recognition. The 

 change in appearance is a striking one and is as characteristic as 

 the alteration of the bark. Paralysis of the hind limbs rapidly ex- 

 tends forward, and it is a race between the progressive paralysis 

 and death, whether or not the paralysis will extend to the front 



