I have a male cat named Chip, that is the most affectionate,
cuddly, fluffy little guy you'd ever want to meet.  Except
for when another cat is nearby, outside the window or door.
When another cat invades his "territory", he goes berserk.
Normally this displaced aggression is not that serious, but
occasionally it is.  In that case, I get the water pistol
and squirt him, until he runs up stairs, to cool off!
I noticed that a neighborhood cat has been hanging out
behind a 15 foot hedgerow in the front of my house.
Would could I place behind the hedge to keep the cat
away from my hedge?  Would it help if I took some of
my cat's hair and placed it behind the hedge?  Is there
something commercial available?

-Thanks