A word of caution about any laxative. They should only be used occasionally, not long term as they can cause dependency. It also takes water from the intestine to absorb into the stool to soften it, so make sure your kitties are only on canned food and perhaps add a couple of teaspoons of water just to make sure. 
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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