134 ANIMAL INTELLIGENCE 
all to move quickly away with tails down and other 
expressions of fear. 
34th day.—Tested them with a napkin and Spratt’s 
dog biscuit as on the 28th day. Now they all show 
very decided preference for the biscuit, which is not so 
attractive as a bone to any dog. One or two began to 
smell about the floor of the pen as an old dog does, and 
yesterday one was observed scratching at a spot on the 
floor where some excrement had been. 
At this age puppies have very sharp teeth, and it is 
not very uncommon now to hear one cry out when his 
fellow uses his jaws too freely in play. 
Scratching is more common. 
While the winking reflex, from a simple movement of 
the hand as before, is not readily produced, a sudden 
tap on the ledge of the pen will cause winking if they 
are looking that way, and within a foot or so of the spot 
struck. They also wink when the muzzle is suddenly 
touched. 
35th day.—They now retire to one end of their pen 
to answer nature’s calls. 
They are noticed smelling at the shoes of any one 
who happens to be near them. 
They bark in sleep like older dogs. 
When the finger is thrust into the mouth some suck 
a good while, some not at all. 
36th day.—They follow me around their kennel 
compartment, and are inclined to seize the skirts of a 
very long coat I wear. By way of testing recognition 
of the dam, she and her other puppy, eight months old, 
and nearly as large as herself, were brought to the 
puppies together. They all at once rushed to the dam. 
But soon after her removal they attempted to suck the 
younger bitch, though from their sniffing it seemed to 
me they noticed her strange. 
Later in the day the small bitch (Bedlington terrier) 
