Hello, n lets help your majestic friend NOW ! Whatever is ailing him won't kill him if "whatever goes in comes out"..
to facilitate this in the most pleasant way possible...Spring for a can of ALBACORE TUNA IN VEGETABLE OIL My Kidz prefer Bumbling bees but I'm sure they are all equally lubriquitive !
Don't give 'im the whole can just enough that he's not just drinking the oil (juice),but make sure the Tuna meat is soaked in it. That should "this too shall pass" ANYTHING that he hasn't been able too on his own ..Put the spring right back in his pounce !

If he is still "not right" after he poops,watch how he walks does he favor one side, does he avoid jumping up onto the sofa,bed,anywhere...That would indicate bowel obstruction
which generally means surgery...You think your short now !
4 grand plus for that...Trust me I KNOW, I paid it ...9 yrs later she's snoozing ,one eye on my note here,making sure I don't leave anything out...

INSURE YOUR PETS it's a small price in avoiding a HUGE HOLE IN ONE'S HEART....That aside, sometimes X-rays n Ultrasounds
MISS thins like HAIR TIES, that little gold plastic seal breaker off a pack of smokes, ANT KIND OF REFLECTIVE CELLOPHANE off say A CAT TOY (they are all in Cahoot's I tell ya )

I Wish you and your friend all the best .please keep us apprised of his condition

Paws crossed

Wolfcat