I have 2 cats one fixed male 10 yrs old, one fixed female 2-3 years
old.  They are outside cats.  A week ago or so the female was acting
weird, She wouldn't come into the garage when called she sat outside
the door face lowered to the ground showing little intrest to the
calls.  her chin was dirty as though she had drooled and it dried a
blackish color.  She was gone a few days (not normal) then appeared  a
few days later seemingly better.  she comes up for attention now but
her mouth seems to quiver as though registering a new smell.  The male
was okay then he became lethargic and not leaving the garage.  He
doesn't open his eyes all the way, he has gunk below the lids and the
same dried drool under the chin.  Their appetite hasn't been very good
I believe at least one of them is drinking water if not both.  The
male is usually a good eater and quite mouthy in the evening to get
attention.  Not the case now.

There were a couple other cats in the neighborhood that would stop in
for a meal on a regular basis and I haven't seen them in a few weeks
nor has the food in the bowl signified their participation in
mealtime.  This is a new neighborhood (6 months) in a previous desert
locale.  new people are moving in every day and I am worried that some
may not like cats and try to poison them.  I haven't noticed seizures,
cramping, diarea but they are outside cats and we may not see all of
their actions.  The male in the garage has not shown convulsions or
anything other than cold like symptoms and sleeping constantly.

Any Ideas?

Thank You.