Revolution almost killed a member's cat here a few years back, it's totally NOT recommended for underweight, weak, sick, or debilitated cats or kittens. We were even successful at having the internationally distributed label changed to reflect that fact, as only their US label said that warning (it's called a different brand overseas - but it's the same product). Just wanted to mention it, since you said they treated momma cat with it at the shelter. I would never use it on a pregnant cat, even if the label says it's OK.
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