In article .com,
TiLeaves writes

I apologize in advance if this inquiry is distasteful, but we have an
elderly arthritic (but so beloved) Chesapeake Bay Retriever dog who
tends to pee not far from our back (kitchen) door stoop, especially
during the winter months when snow and ice deter her from venturing
farther.

I don't think taking away the grass for slabs is going to make her want
to venture further out into the snow!

Usually bitches urine does make grass go yellow if it is constantly
used. Feeding her tomato juice can change the pH of her urine if she
will drink it but other than that why not make it gravel? That way it
will be easy to sluice down. Otherwise you are going to get wet frozen
patches of widdle to endure every time you go out of the back door!

--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk