Dinah wrote:
Huh? Dogs nails don't scratch glass? Sliding glass doors made out
of plexiglas? The door is tempered glass. The dog is large with
sharp nails even after the groomer trims them. She has scratched
the door on the outside when she wants in and on the inside when
she tries to get to the squirrel. If you know how to train her to
keep her off the glass please tell me.

No, dog's nails don't scratch glass. The sharpness of the nails has nothing
to do with it, only the relative hardness of the materials. Glass has a
Moh's hardness of around 7...many, many, many times harder than the material
from which dog nails - and yours - are made. Can you scratch glass with
*your* fingernails? Not a chance...

If the glass is being scratched then either it has some sort of plastic
coating or your dog's nails are picking up sand which is doing the
scratching.

Seems to me that latter is unlikely for two reasons. First of all, sand
would be unlikely to stick to the part of the nail with which dogs scratch.
Secondly, "sand" is a word that refers to particle size, not composition.
For "sand" to scratch, it would have to have particles composed of minerals
harder than the glass...such minerals as corundum, quartz, et al. Now, you
may well have such sand but *most* sand is of other, much softer material.

--
dadiOH
_____________________________

dadiOH's dandies v3.0...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico
____________________________