The Dog Mammals 
at night; this is an ancestral habit to call the pack 
together; it is interesting to note that the dog when 
howling lifts his nose in the air so as to send the 
sound far and wide. The reason that occasionally 
a dog howls when he hears music, is because it 
probably reminds him in some way of the howling 
of the pack, and he at once joins the chorus. 
Although we know that our dog descended from 
a wild animal, we do not know just which ones of 
the wolf tribe were his ancestors, for the dog was 
man’s domesticated companion long before there 
were any picture records of man’s history. It is 
believed that the savages of different lands developed 
their dogs from the native wild species of wolves or 
dogs in order to use them to help in hunting. The 
scientists who study the specimens of animals 
preserved in the rocks, tell us that the dog’s brain 
has increased in quality and size through his asso- 
ciation with man. 
More than two hundred breeds of dogs have been 
developed by man, and each one has its own peculi- 
arities, and therefore should have special treatment. 
All that we can do in this little book is to give 
general directions which are equally good for all 
dogs. 
DIFFERENT BREEDS OF DOGS 
Although different species of wild dogs or wolves. 
may have been responsible for some breeds of dogs, 
like those used by the Eskimo, and although Egyp- 
tian pictures made more than five thousand years. 
ago show that even then various breeds had been. 
developed, yet most of our common breeds have been 
developed in Europe and England within a few 
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