I know this is a gross topic but we're all friends right?  My 13 month old
cat, which I adopted about a month ago has UNNATURALLY stinky poop.
Seriously.  We have another cat and I've had cats in the past and never
encountered something like this.  

My boyfriend who adores this cat is so disturbed by the situation that he
said if we can't solve this problem we may need to give him up because "I
can't live like this".  It's so embarrassing that we can't invite people over
for fear that stewie will do something disturbingly stinky.

Here's what I'm feeding him - science diet "advanced formula" that I got at
the vet's office - the vet says its a quality cat food.  The package says
it's for "adult cats" from 1-7.  do you think that perhaps he needs kitten
food?  my other cat also eats the same food without issue.

I adopted the cat from the vet's office - he has received all of his shots
and was given a clean bill of health when I adopted him - which wasn't that
long ago. fyi - the cat is neutered.

I'm worried that he's sick - or that the food is too intense for him.  I will
be seeing my vet for my other cat on tuesday for an unrealted issue with my
other cat- but I'm wondering if I could get some advice now.