How old are your cats? If they are getting on in years, you might want to have the vet check them for kidney failure. They do a blood test that tests several different "levels" in their blood. Tubby was always one to have hairballs, but when it got to the point of almost everyday, I figured I better have him checked out. Turns out he is in the beginning stages of kidney failure. Since they caught it early enough, it wasn't fatal. I give him 1/4 of a Pepcid everyday and this seems to have dramatically slowed the progress of the kidney failure. He was diagnosed over 2 years ago now (I think) and he is doing fine. However, I was recently reminded of how important it is to him to get this Pepcid everyday. We left Saturday morning for the weekend, didn't get back until Sunday evening. Since it was only overnight, I didn't call the pet sitter, so Tubby had no Pepcid on Sunday. Monday morning he had a major puke session and it was horrible for me because I felt so guilty.
The vet says the Pepcid not only slows down the progression of the kidney failure, but it helps soothe his tummy too, which means he feels like throwing up less, which is a good thing all around.
So, you might want to have the kitties checked out by a vet. Even if they have no problems with their kidneys, the vet might have some suggestions for you since the Petromalt doesn't seem to be working.
Oh, and kidney failure is sort of a common thing among older cats - but young ones have been known to get it too.
Good luck, and let us know what you find out.
Tubby
Spring 1986 - Dec. 11, 2004
RIP Big Boy
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Peanut
Fall 1988 - Jan. 24, 2007
RIP Snotty Girl
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Robin
Fall 1997 - Oct. 6, 2012
RIP Sweet Monkeyhead Girl
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