Hyperesthesia of the Neck. 



This condition, sometimes termed "crazy" sore 

 neck, is well-known among veterinarians and affects 

 only work-horses. It appears in two forms; one in 

 which the neck appears to be only slightly sore at the 

 collar seat; the other, in which there is a plug or 

 wedge of necrotic, dry tissue in the centre of the 

 region. 



The first form is the most difficult to terminate. 

 The horse, when an attempt is made to put on the 

 collar or take it off, becomes literally crazy; he at- 

 tempts to kick, strike, rear up or bite; in many cases 

 becoming w^ell nigh unmanageable. While these 

 cases usually begin with an ordinary *'sore neck," the 

 animal seems to retain his **crazy" disposition even 

 after the parts have been healed up and no trace of 

 "sore neck" is evident. 



The second form, in which there is present a plug 

 or wedge of dead tissue, is easily brought to a favor- 

 able termination. Surgical removal of the dead mass, 

 (which usually has the appearance of horn and may 

 be several inches in length and imbedded deeply) and 

 then treatment of the wound puts an end to the 

 trouble. 



In the first form, however, there seems to exist a 

 genuine hyperesthesia of the neck region and a severe 

 underlying dermatitis is always present. The only 



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