12 



INTRODUCTORY CHAPTER. 



III. HOUSE DOGS. 



Characteristics. Muzzle more or less shortened ; skull liigli ; 

 frontal sinuses considerable ; condyle of the lower jaw extending 

 above the line of the upper cheek teeth. Cranium smaller in this 

 group than in the first and second, in consequence of its pecidiar 

 formation. 



Skull of Mastiff. 



Sect. 9. Watch dogs which have no propensit}^ to hunt, but are 

 solely employed in the defence of man, or his pro- 

 perty. Examples : the Mastiff, the Bulldog, the Pug 

 dog, &c. 



As before remarked, this division is on the whole founded on 

 natural laws, but there are some anomalies which we shall en- 

 deavour to remove. For instance, the greyhound is quite as ready 

 to huut in packs as any other hound, and is only prevented from 

 doing so by the hand of his master. The same restraint keeps him 



