Brian Henderson wrote:

On Fri, 12 Mar 2004 10:13:02 -0500, "dadiOH"
wrote:

It's not hard to understand...soft materials can't scratch harder ones. The
"sharpness" doesn't count; for example, you could put a decent edge on a
piece of brass but couldn't cut steel with it regardless of how sharp the
edge was.

But regardless, it seems to be happening all the same. You have quite
a few people telling you that you're wrong, you just don't want to
listen.

Shoot, it is a matter of physics, hard science. Soft materials cannot
scratch harder materials. Harder materials do scratch softer
materials. The fact is that the windows is scratched, so it is
obvious that the dog claws carry materials harder than the glass, if
the glass is indeed scratched and not just a coating on the glass.
Contrary to what one writer said, most sand is composed of materials
harder than window glass.