ANIMAL DENTISTRY. 



243 



head in a more advantageous position for leverage. Such 

 animals often have serious lesions of the jaws, but these are 

 effects rather than causes of the habit. The habit is often 

 acquired by driving an ambitious, prompt horse with a 

 "loafer." 



The horse that drives on but one line without pulling 

 heavily and shifts gradually to one side of the street belongs 

 to an entirely different class. In this incident the cause is 



Fig. iss. 



Fig. 156. 

 The suitable bit to equip with the 

 flexible rubber hose. See 

 description below. 



Fig. 157. 



Tongue Lolling Bits. 



A. Port bit. 



B. Spoon bit. 



C. Combined snaffle and overcheck bit. 



always due to some defect in the locomotory apparatus. 

 Spavin or other slight painful condition of the hind extremity 

 is the usual cause of this defect. 



Treatment — The side reining horse must first be treated 

 for defects of the teeth and lesions of the interdental space. 



