This is NOT a mandatory update 2.2.75 it fixes a few bugs probably unnoticed by you AND it makes alllll the marvelous new toys work on the cats annnd the slippery ice.
(the wolf update will be along soon but not today)

Best practice of course is to have both sacks and cats updated to the current version.  You may do this in your own time.  MOOG has the current version of the updater.  The individual and the by species versions of the animals.  This is NOT a food update.  This is for your cats and your cat sacks.  It will not harm a pregnancy in anyway shape or form to MOOG a pregnant MOM to be or a Dad to be.