I have a 5 year old B & W tabby that has been having problems with
throwing up several times a week.  It's as if it is bulimic.  She is a
house cat and never goes outside.  She was spayed at 1 year old or
thereabouts with no problems.  Otherwise she exhibits good health.

It is not loosing any weight by any means and input/output appears to
be OK.

We have one self-filling feeding station for 3 cats, a mother and two
siblings.  To date this has not been an issue.  They all eat when
hungry so there is no issue with sharing or so it seems.

This one cat eats the dry kibble, possibly in excess, and a short time
later hacks up a long trail of moist and formed food.  It appears as
if its the contents of the esophagus in a long trail about th elength
of the middle finger, and as if its not getting passed the stomach
sphincter into the stomach.

Oddly, I sometimes see this happen with one of the other cats but not
with the same frequency as this one.  There is usually plenty of water
available.  We've been using the same brand of kibble for many years
with no problems.

As noted this one cat has us worried, but at the same time she is not
exhibiting any other problems. Weigh is OK, in fact a little on the
heavy side.  She poops and urinates fine.  No lethargy or other
obvious symptoms.

We're on a fixed income so a vet is a luxury.  I'm hoping there may be
other answers to be considered.