196 THE DISEASES OP THE HORSE. 



chloride solution, or sulphuric acid and tar. In persist- 

 ent cases caustics and astringents must be changed fre- 

 quently. Tonics and salines. Liberal diet. Cleanliness. 

 Pressure to fetlock for bleeding. Pack with dry tow; 

 bandage ; protect with leather boot. For doses, see pages 

 13 to 29. 



THRUSH 



Is a fetid discharge from the frog. The cleft is usually 

 first affected. If neglected the disease spreads over the 

 whole organ, the horn becoming detatched from the bulbs 

 of the heels to the toe of the frog. The cause is usually 

 filth, but the disease may originate in frost-bite, grease, 

 swelled legs, &c. 



Thrush differs from canker in the nature of the dis- 

 eased secretion, and also in its course and tractability. 



Remedy. — Cleanliness. A leather sole may be placed 

 within the shoe. Dust with calomel. Dress with tar or 

 wood tar oil. Dose of physic, especially when associated 

 with constitutional causes. Regulate feeding and work. 

 Shoe with tips if feet strong and animal works chiefly on 

 land. 



BONE SPAVIN 



Is a bony tumor on the inner and lower part of the 

 hock, arising from inflammation of the cuneiform and 

 metatarsal bones, terminating usually in stiffness of one 

 or more of the gliding joints of the hock. It is very 

 rare on the outer side of the hock. 



Spavins arise from causes that are hereditary or consti- 

 tutional and local. The local or exciting causes are sprains 

 of the ligaments and concussion of the bones. One fer- 

 tile cause is the alteration of the direction of the leg, 

 induced by the use of high calkin ed shoes. These high 

 heels alter the relative position of the limb, from the hip 

 downward, and cause shocks of concussion at every step. 



Remedy. — Rest. Purgative and fomentations where 



