ERUPTION OF THE PERMANENT TEETH. 



199 



Two to Four Months. — A month before the eruption of the 

 permanent teeth the temporary pmchers and often the inter- 

 mediate teeth in both jaws become loose and fall out ; at this 

 time the points of the permanent teeth can be felt by pressing on 

 the gums. (Fig. 180.) 



ERUPTION OF THE PERMANENT TEETH. 



The permanent teeth replace those of first dentition several 

 months earlier in the large races of dog than in the terrier varie- 

 ties. Medium-sized dogs, setters, etc., make the change later 

 than the large dogs and earUer than the terriers. 



Fig. 179. Fig. 180. Fig. 181. 



Fig. 179. — Teeth of puppy two months old. 



Fig. 180.— Teeth of dog four months old ; the incisors are loose and ready to fall out. 

 Fig. 181.— Teeth of dog one year old, showing the incisors and tushes fresh and unworn. 



Five to Eight Months, — According to the race of dog, the 

 permanent teeth appear rapidly in the following order : pinchers, 

 intermediate, corners, and tusks. The incisors do not come out 

 obliquely, as in the herbivora. It is worthy of note tliat, while 

 the herbivora do not have all of their permanent dentition until 

 they have arrived at their full development of body, the car- 

 nivora have theirs long before they have attained their growth 

 and before the consohdation of their bones. 



One year. — For the first few months afler their appearance 

 there is no alteration in the teeth; at one year they are pure 

 white and the tubercles on the incisors are intact. (Fig. 181.) 



Fifteen Mmiths. — From fifteen months on, commences the 

 wearing away of the teeth. This is first seen on the inferior 



