K.S.
I have used the grounds from Starbucks to deter neighborhood kitties from invading my gardens. Apparently they do not like the stuff on their feet and the smell. I have been using it for a few years and its great.. Plus it fertilizes your garden beds as well. I actually found out about it while waiting in line at Starbucks one early morning. A lady was coming by to pick up the free grounds (that is another nicety about this method.. its free) and she was talking about how great it is in repelling cats.. Its been a lifesaver..
Hope it helps.