Dogs have sweat glands in their feet.
I copied this off the net:
Dogs also have sweat glands on the pads of their paws and on their noses.
These are eccrine glands. When these glands are active, they leave the nose
and pawpads slightly moist and help these specialized skin features
maintain their functional properties. The odor associated with dog paw pads
is much more noticeable on dogs with moist paw pads than on those with dry
pads. |