Previous studies have shown that humans between the ages of two to three
 typically learn to associate words with the shapes of objects, rather 
than their size or texture. For example, toddlers who learn what a 
‘ball’ is and are then presented other objects with similar shapes, 
sizes or textures will identify a similarly-shaped object as ‘ball’, 
rather than one of the same size or texture.
In this new study, the scientists presented Gable, a five year old 
Border Collie, with similar choices to see if this ’shape bias’ exists 
in dogs. They found that after a brief training period, Gable learned to
 associate the name of an object with its size, identifying other 
objects of similar size by the same name. After a longer period of 
exposure to both a name and an object, the dog learned to associate a 
word to other objects of similar textures, but not to objects of similar
 shape.
According to the authors, these results suggest that dogs (or at 
least Gable) process and associate words with objects in qualitatively different ways than humans do. They add that this may be due to 
differences in how evolutionary history has shaped human and dog senses 
of perceiving shape, texture or size.
The bottom line: Though your dog understands the command “Fetch the 
ball”, but he may think of the object in a very different way than you 
do when he hears it. As the authors explain, “Where shape matters for 
us, size or texture matters more for your dog. This study shows for the 
first time that there is a qualitative difference in word comprehension 
in the dog compared to word comprehension in humans.”
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