Read somewhere, maybe in this group,  about some of your kitties
throwing up.  I've had those problems for 15 years with several
different kitties and NOTHING! helped.  But had to leave town for a
few weeks and left my several :-) kitties with a friend.  No One!!!!
threw up.  The secret:  He left their (dry)food down so they could
eat at their leisure.  No one horses it down--no one throws up. Also
he was much more consistent as to when he fed them --no more than 12
hours between feedings;  they *knew they would be fed at certain times
and didn't sweat it :-)  Since I've been home--it's three weeks now I
have not had a single kitty throw up.  No more swearing and whining --
and mealtimes are fun again.  

Insofar as their alternate meal(s): chicken, turkey, tuna (I try to go
easy on the canned cat food), of course I  wait for them to get done.
But the dry meal where they ate their fill seems to ddo the trick and
gets them through the day so that they don't throw up this wet meal,
either.  .  

Good luck.   I hope you all, two and four-legged guys, benefit from
this msg.

Star E.