I've put in a call to my vet, but thought I'd try to get some thoughts here
in the meantime.

Any suggestions on what I could give my 8 year old male neutered cat to help
soften his stool?  I don't want to give him pumpkin or a food with more
fiber, because added fiber can sometimes help stool pass more easily -- but
it also makes the stool harder.  I need to make his stool softer.

What about milk or cream?  

(I don't want to tempt anyone into a discussion about good brands/bad
brands, but I feed this beastie mostly Science Diet Senior canned food, with
some Science Diet Senior dry food, both of which are fairly low fiber.)

Any thoughts are appreciated. Thanks.

JEP