These are heavy duty tools used for dogs who have coarse, thick coats of fur such as the Afghan, German Shepherd, or Schnauzer. (herepup.com)
A thicker coat of fur or a faster dog... is a FAR cry from «something from nothing»... and if you dig back and retrace your evolutionary hypothesis, at some point, you have to acknowledge «something from nothing». (religion.blogs.cnn.com)
Because it does little good to have sweat glands where a thick coat of fur is located, dogs have most of their sweat glands around the pads of their feet. (mnn.com)