Common Ailments. 131 



have no apparent effect upon some dogs, 

 while upon others action Is feeble or de- 

 layed much longer than It should be, gen- 

 erally for the reason that they have eaten 

 something that counteracts the virtue of the 

 medicine given. 



Occasionally a dog will be found upon 

 which a certain drug or mineral will alv/ays 

 fall to have any appreciable effect, no mat- 

 ter what may be the condition of his 

 stomach. On the other hand, It Is often 

 the case that an ordinary dose, such as any 

 veterinarian would usually prescribe, will 

 prove to be much more than Is necessary 

 to produce the desired result, and In some 

 cases danger may arise from this cause. 

 For this reason, If no other existed, It will 

 be readily understood that It Is absolutely 

 necessary that all powerful medicine should 

 be administered only by those who are 

 qualified not only to correctly diagnose a 

 case and prescribe the proper medicine, but 

 to determine from the effect produced what 



